Joshua was the chief leader of the people in the time of Hadrian, and appears to have performed the duties of Patriarch, for Gamaliel had probably died at the commencement of Hadrian's reign. The honors paid to his dead body show the high esteem in which he was regarded by the people. Joshua, Eliezer, and his disciples mourned for him; Akylas the proselyte—as was customary at royal funerals—burnt clothes and furniture to the amount of seventy minas. When reproached for this extravagance he said, "Gamaliel is worth more than a hundred kings, from whom the world gains nothing." A striking contrast to this display was afforded by the simplicity of the shroud which Gamaliel had expressly ordered before his death. It was customary at that time to clothe the corpse in costly garments, an expense which fell so heavily on those of small means, that many deserted their dead relations in order to avoid the outlay. To prevent such expense, Gamaliel ordered in his last will that he should be buried in simple white linen. From that time greater simplicity was observed, and it became the custom at funeral feasts to drink a cup to the memory of Gamaliel. He left sons, but the eldest, Simon, appears to have been too young to undertake the patriarchate, which, therefore, devolved on Joshua probably (as his representative, Ab-bet-din). After Gamaliel's death Joshua was desirous of abolishing various ordinances which the former had enforced, but he was opposed by Jochanan ben Nuri, who was supported by most of the Tanaites.

It is hardly possible to doubt that the Jamnian Synhedrion removed to Upper Galilee after the death of Gamaliel, and Usha (El-Uz) in the vicinity of Shefaram (Shefa-Amar), between Acco and Safet, became the seat of the Synhedrion. Ishmael is mentioned amongst those who emigrated to Usha. Here the Synhedrion made various enactments of high moral and historical importance, which took the form of laws, under the title of Ordinances of Usha (Tekanoth Usha). One of these laws decreed that a father must support his young children—the boys until their twelfth year, and the girls until they married. Before this time the provision for children had been left to the option of parents. Another law enacted that if a father during his own lifetime gave up all his property to his son, it followed, as a matter of course, that the son must support both his father and the wife of his father. A third law limited the reckless devoting of the whole of a man's property to charitable purposes, which custom prevailed at that time. This law prescribed that only a fifth part of the property might be given away. Isebab, who afterwards died the death of a martyr, was desirous of dividing his whole property amongst the poor, but Akiba opposed him, referring him to this law respecting property. One decision of Usha seems to have been directed against Gamaliel's severe employment of the interdict. It decreed that no member of the College should in future be excommunicated unless he actually despised and revolted against the whole Law, like King Jeroboam. This circumstance shows that the unity of the Law was so established that a difference of opinion no longer implied, as formerly, a total break, and Joshua, no doubt, had contributed to this result.

The tolerable relations between Hadrian and the Jews did not last much more than a decade. He could not forget that he had been compelled to make concessions to the despised nation, and the latter could not forget that he had broken faith with them, and had deprived them of their fairest hopes. This mutual antipathy displayed itself during Hadrian's journey through Judæa. The emperor, urged by vanity, and a desire to be called the father of his country, and impelled by a restlessness and want of occupation, which drove him from one spot to another, had visited nearly all the provinces of the great Roman empire, for the purpose of seeing everything with his own eyes. Hadrian's petty curiosity led him to concern himself with all manner of things, to desire to be considered as a philosopher, and better informed than his contemporaries in all matters. Whether he judged the condition of other provinces correctly may be doubted; he certainly was deceived in his hasty judgment of the Jews. During his visit to Judæa (130), it is probable that those people, such as the Romans, Samaritans, and Christians, who disliked the original inhabitants (the Jews), approached him with subservience, in order to greet him as a demi-god, or even as a god. A pantomimic conversation, which was held between a Christian and a representative of Judaism, Joshua ben Chananya, in Hadrian's presence, describes their respective positions. The former showed by gestures that the God of Israel had hidden His face from the Jews; the latter showed, by a movement of the arm, that God still stretched forth His hand to protect Israel, and this pantomime Hadrian desired to have explained to him. He seems to have had many interviews with Joshua. Several conversations between Hadrian and the Tanaite have been handed down, of which one appears to be credible. He asked him, "If you are as wise as you assert, tell me what I shall behold this night in my dreams." Joshua replied, "Thou wilt dream that the Persians (Parthians) will subdue thee, and compel thee to guard low animals with a golden scepter." This retort was well chosen, for the superstitious emperor feared the Parthians beyond all nations, and did his utmost to maintain peace with them.

Hadrian thought that he had nothing to fear from Judæa. He informed the Roman Senate of the peaceful disposition of the Jews, and they perpetuated their credulity by various coins, in which the emperor is represented dressed in a toga, raising a kneeling Jew from his humble position. Three boys (probably emblematic of the districts of Judæa, Samaria, and Galilee) hand him palm branches. He thus cherished the expectation that racial and religious differences would soon disappear, and that the inhabitants would merge their identity in that of the Romans. In order to induce such a state of things he drew up a plan, which could not have been more unfortunately conceived. Jerusalem was to be rebuilt, but as a pagan city. Whilst he repaired to Egypt to commit other follies, the desecration of the holy city was commenced. The Jews naturally did not remain unmoved at this act, which was to erase their name as a nation and a religious body from the book of the living, and a bitter feeling overcame them. Joshua again appears to have endeavored to bring about a reconciliation in order to frustrate the thoughtless plan of the emperor, and to allay the discontent of the people. Though an aged man, he traveled to Egypt in order to induce the emperor to alter his mind.

But his prudent suggestions were ridiculed; the emperor would only mock at the Jewish, Samaritan, and Christian religions, with which he thought himself thoroughly acquainted. He wrote at this time to his brother-in-law, "No president of the synagogue (Rabbi) of the Jews, no Samaritan, no Christian priest, honors anything but Serapis. Even that patriarch who has come to Egypt [probably Joshua] was compelled by some to worship Serapis, and by others to worship Christ." Joshua returned to Judæa after his fruitless visit, and appears to have died soon after of grief and old age. It was justly said of him that with his death wisdom and prudent moderation came to an end. After his decease there occurred wide-spread movements and contests in Judæa, which were among the most memorable in its history, and there was no one to stem the tide.

So long as Hadrian remained in Syria (130–131) the malcontents did not commence the revolt for which they had probably been long preparing. The weapons prepared by the Jewish smiths for the Romans were made (in anticipation of their being used against themselves) weak and useless. In the hollow chalk mountains of Judæa the insurgents silently prepared underground passages and refuges, which were used as secret armories before the war, and afterwards as secret ambushes, from which the enemy could be attacked. Akiba seems to have developed a silent but effective activity in his preparation for a revolt. After the death of Joshua he was recognized as the head of the Jewish community. Hadrian, lulled into security, discovered the conspiracy only when it broke out at the various points of the Roman empire, so skilfully had the Roman spies been deceived. When the revolt was about to commence everything was in readiness. There were stores of arms, means of communication, warriors, and even a powerful leader, who, through his strange position, infused religious enthusiasm and warlike courage. It was considered as a favorable sign for their daring undertaking that two of the stations of the Roman legions had been destroyed. Cæsarea and Emmaus had been swallowed up some years before by an earthquake. Cæsarea was the Roman capital of Judæa, the dwelling-place of the governor, and, like Rome, it brought down the hatred of the Jews on itself. The peculiar idea was entertained, that, as the greatness of Cæsarea had dated from the time of the destruction of Jerusalem, so from the fall of Cæsarea Jerusalem would again attain to power. Emmaus had been the dwelling-place of eight hundred soldiers of Vespasian who had served there; it therefore had been used as a second citadel.

The chief hero of the revolt was Bar-Cochba, who inspired the Roman empire in its then state of weakness with as much terror as Brennus and Hannibal had formerly done.

Not a trace, however slight, can be found of the descent and early life of this much reviled and misunderstood personage. Like the hero of every revolution, he suddenly appeared as the perfect incarnation of the nation's will and the nation's hate, spreading terror around, and standing as the center-point of an eventful movement. His real name was Bar-Kosiba, doubtless from the town of Kosiba, and was not a nickname meaning "son of lies." Bar-Cochba was a symbolical Messianic name which Akiba had given him. When Akiba, actively engaged in the deliverance of the Jewish people, first saw Bar-Cochba, he was so impressed with the appearance of the man that he said, "That is a Messianic king." Akiba applied to him the verse of Scripture, "Kosiba has arisen as a star (Cochba) in Jacob." Akiba was confirmed, by the imposing personality of Bar-Cochba, in his hopes that the Roman power would soon be overthrown, and that the splendors of Israel would once more shine forth, and he looked forward through this means to the speedy establishment of the Messianic kingdom. He cited the verse of the prophet Haggai with regard to this (ii. 21), "Yet a little and I will shake heaven and earth."

All did not, however, share Akiba's pious enthusiasm. Jochanan ben Torta, a teacher of the Law, replied dubiously to his high-flying hopes, "Sooner shall grass grow from thy chin, Akiba, than that the Messiah will appear." The respect and attention, however, which Akiba displayed towards Bar-Cochba were sufficient to surround him with a halo, as of a higher God-given power, which gave him unquestioned authority, and increased the means at his disposal.

There is no record in Jewish sources of miracles performed by the Messianic king for the gratification of the populace. But an account of the enemy relates how Bar-Cochba puffed forth burning tow from his mouth to give himself the appearance of spitting fire. The Jewish accounts speak of his enormous bodily strength. They relate that he cast back with his knees the huge stones thrown by the Romans by means of machines on the Jewish army. There is no hint given that he pursued any selfish end by his Messianism; he was actuated only by the wish to win back freedom for his people, to restore the tarnished glory of the Jewish state, and to throw off at once and for ever the foreign rule which, during two centuries, had interfered with the interests of Judaism. So energetic a mind, combined with great military talent, even though it failed to secure a favorable result, should have received juster recognition from posterity, and certainly does not deserve the prejudice which it met with from interested contemporaries. The Jewish warriors from all countries poured forth to aid the Messianic king, and the revolt became one of great dimensions. Even the Samaritans joined their former opponents, as the chronicles relate. Heathens themselves made common cause with the Jews, impelled by a desire to shake off the unbearable Roman yoke. It seemed as if the whole Roman empire were about to receive a heavy blow, by which the various members of its gigantic body were to be rent asunder. From these facts the number of the warriors cannot be considered as exaggerated if the Jewish sources put them down as 400,000, whilst the Pagan historian Dio Cassius rates them even at 580,000. Bar-Cochba felt so confident in his own courage and the numerous warriors at his command, that he is said to have uttered the blasphemy, "Lord, if thou dost not help us, at least do not help our enemies, and we shall not be defeated."