With the arrival of the Romans the approximate date and origin of Bath can be readily ascertained. From excavations on the place since the year 1875, it has been proved that the Romans founded here a city, which they named Aquae Solis, in the reign of Claudius. In 55 B.C. the baths had been constructed for certain. In addition to this they erected a temple to Minerva, with votive offerings, and many other buildings, and carried a line of fortifications and walls around the city. The remains of their marvellous architecture still bear testimony, though they have suffered ill-treatment and undergone restoration, to their former magnificence and grandeur.

On the retirement of the Romans Aquae Solis passed into the hands of the Britons, under the name of Cœr Palladen (the city of the waters of Pallas). During their possession of a century, two attacks made by the Saxon chieftains, Œlla and Cerdic, were repulsed by King Arthur.

The Saxons, by the year 577, having practically subverted the rest of the kingdom, turned their attention to the West. They seized and ravaged Bath. The Roman structures were reduced to ruins. After a while they rebuilt the walls and fortifications upon the original foundations, employing the old materials. The baths also were soon restored. By this time the Saxons had renamed the city, "Hat Bathur" (Hot baths), and "Ace-mannes-ceaster" (City of invalids). The "ceaster" tacked on to the Saxon word is the first evidence we get of the Saxon recognition of the former existence of the Roman occupation of this city.

With the spreading influence of Christianity travelling from the east to the west of England in the seventh century, a nunnery was erected here, in 676, by King Osric. This was destroyed during the wars of the Heptarchy, and on its site a college of secular canons was founded, in 775, by Offa, King of Mercia. This monarch had taken Bath from the King of Wessex, and had annexed it to his own kingdom. Possibly in recognition of this victory he built an abbey in 775.

After this the city evidently increased in prosperity, for it was important enough to witness the coronation of Edgar in 973, as King of England, by Dunstan, Archbishop of Canterbury. At the same time Edgar converted the college of secular canons into a Benedictine monastery. This, with the church, was again demolished by the Danes.

This city of Bath, like all other cities of that time, came under the Norman Survey, and was entered in Doomsday Book as Baden-ceaster. William Rufus had scarce been crowned king when Bath was seized and burnt, the most part by Geoffry, Bishop of Coutances, and Robert de Mowbray. They had jointly risen in support of the claim laid to the throne of England by Robert Duke of Normandy. But under the abbacy of John de Villula it soon recovered prosperity. This abbot, on promotion to the See of Wells, about 1090, purchased the city from Henry I. He built a new church, and removed the See from Wells to this place. Here it remained till 1193, when Bishop Savaricus handed it over to Richard I., in exchange for Glastonbury Abbey.

About this time Bath received its first charter as a free borough from this monarch, and was represented in Parliament in 1297. In 1330 the manufacture of woollen cloth was established by the monks. By reason of this the shuttle was incorporated in the arms of the monastery. In 1447, and in 1590, Henry VI. and Elizabeth respectively granted charters, which materially increased the prospects of the city.

This present cruciform Abbey Church dates from 1499. It is dedicated to St. Peter and St. Paul, and forms one of the best specimens of the later style of English architecture. It rests upon the site of the conventual church of the monastery founded by Osric. After a course of eight hundred years it became dilapidated, and was rebuilt from the old materials in 1495, by Bishop Oliver King. He is said to have been admonished in a dream. He did not live to see the completion of the building.