British Emperor  Although in the past the style of British Emperor has been (retroactively) applied to a few mythical and historical rulers of Great Britain, Ireland or the United Kingdom, it is sometimes used as a colloquialism to designate either Plantagenet and Tudor caesaropapism or, more frequently, the British sovereign of the Empire of India. The mythical British ruler King Arthur is referred to in medieval Welsh texts as "ameraudur" (meaning "emperor"). The Welsh poem "Geraint, son of Erbin", written in the 10th or 11th century, describes a battle at a port-settlement and mentions Arthur in passing. The work is a praise-poem and elegy for the 6th-century king Geraint, provides the earliest known reference to Arthur as "emperor". The Britannic Empire was a short-lived breakaway state of the Roman empire in the late Roman Period. It was formed as a result of the revolt by the naval commander Carausius. It ended when Carausius's usurper, Allectus, was defeated by the Emperor Constantius I in 296. Several Kings of England displayed imperial ambition in the period from 930 to 1066, using a variety of what would be considered imperial titles. The most common title was basileus, but imperator, princeps, augustus, and caesar were all used sporadically. In this case the epithet "Empress" was rather used to distinguish this person from other princesses called Matilda or Maud. Matilda was not Empress of Britain; she took her title from her previous marriage to Holy Roman Emperor Henry V. Although several English monarchs flirted with the idea of "imperial" power, this never led to an official change of the title of "King/Queen" to that of "Emperor/Empress". In Christian Europe the use of the title emperor was more than an affectation. A king recognises that the church is an equal or superior in the religious sphere; emperors do not. This was illustrated by Henry VIII of England who started to use the word imperium in his dispute with Pope Clement VII over the annulment of his first marriage. The distinction began to blur when kings began to claim divine rights. William II, Duke of Normandy (who became William the Conqueror) thought it important enough to request and get a papal blessing for his conquest of England. Richard I refused to show deference to Henry VI, Holy Roman Emperor when held prisoner by him, declaring "".