I.
Iapydes. A warlike and barbarous people in the north of Illyricum, between the rivers Arsia and Tedanius; were a mixed race, partly Illyrian and partly Celtic, who tattooed their bodies. They were subdued by Augustus. Their country was called Iaiydia.
Iazyges. A powerful Sarmatian people, who originally dwelt on the coast of the Pontus Euxinus and the Palus Mæotis; but in the reign of Claudius settled near the Quadi in Dacia, in the country bounded by the Danube, the Theiss, and the Sarmatian Mountains. The Iazyges were in close alliance with the Quadi, along with whom they frequently attacked the Roman dominions, especially Mœsia and Pannonia. In the 5th century they were conquered by the Goths.
Ice. In high latitudes, during the winter, rivers are frequently covered with ice of sufficient thickness to sustain the heaviest loads. This means of communication should be used with great circumspection. A change of temperature may not only suddenly destroy this natural bridge, but render the river impassable by any method for a considerable time in consequence of the floating ice.
The thickness of ice should be, to allow the passage of infantry in single file on a line of planks, and 2 yards apart, 2 inches; cavalry or light guns, with intervals, 4 inches; 12-pounder field-pieces, unlimbered and on sleds, 5 inches; 12-pounder field-pieces, limbered and drawn by horses, with intervals between pieces, 6 to 7 inches. Ice when 10 to 12 inches thick bears the heaviest loads. Two tracks of planks laid on the ice for the carriage-wheels to run on, may be employed when there is any doubt as to its strength, or the wagon may be transformed into a sort of sled by fastening two planks under the wheels.
The thickness of the ice may be increased, when the temperature is low enough, by throwing water on it.
When the river is frozen on each side, but open in the middle in consequence of the velocity of the current, a boom stretched across the open space will often check the velocity sufficiently to cause the water to freeze.
Iceni. A British tribe which inhabited chiefly Suffolk and Norfolk. In 61, headed by Boadicea, their queen, they marched southwards and destroyed Verulam, London, and other places, with great slaughter of the Romans, but were defeated by Suetonius near London, and their queen slain.
Ich Dien. I serve; the motto under the plume of ostrich feathers found in the helmet of the king of Bohemia after he was slain at the battle of Crécy, at which he served as a volunteer in the French army, August 26, 1346. Edward the Black Prince, in veneration of his father, Edward III., who commanded that day, though the prince won the battle, adopted this motto, which has since been borne with the feathers by the heirs to the crown of England; but not as prince of Wales, which many have erroneously maintained.