The Round Table is King Arthur's famed table in the Arthurian legend, around which he and his Knights congregate. As its name suggests, it has no head, inferring that everyone who sits there has equal status. The table was first described in 1155 by Wace, who relied on previous depictions of Arthur's fabulous retinue. The symbolism of the Round Table developed over time; by the close of the 12th century it had come to represent the chivalric order associated with Arthur's court.
Though the Round Table itself is not mentioned until Wace the concept of Arthur having a marvelous court made up of many prominent warriors is much older. Geoffrey of Monmouth says that after establishing peace throughout Britain Arthur "increased his personal entourage by inviting very distinguished men from far-distant kingdoms to join it." The code of chivalry so important in later romance figures in as well, as Geoffrey says Arthur established "such a code of courtliness in his household that he inspired peoples living far away to imitate him." Long before Geoffrey, Arthur's court was well known to Welsh storytellers; in the romance Culhwch and Olwen, written around 1100, the protagonist Culhwch invokes the names of 225 individuals affiliated with Arthur. In fact, the fame of Arthur's entourage became so prominent in Welsh tradition that in the later additions to the Welsh Triads, the formula "Arthur's Court" in the titles of the triads began to supersede the older "Island of Britain" formula. Though the code of chivalry so important to later continental romances dealing with the Round Table is mostly absent from the earlier Welsh material, some passages of Culhwch and Olwen seem to prefigure it, for instance when Arthur explains the ethos of his court, saying "[w]e are nobles as long as we are sought out: the greater the bounty we may give, the greater our nobility, fame and honour.
Though no Round Table appears in the early Welsh texts, Arthur is associated with various items of household furniture. The earliest of these is Saint Carannog's mystical floating altar in that saint's 12th century Vita; in the story Arthur has found the altar and attempts unsuccessfully to use it for a table, and returns it to Carannog in exchange for the saint ridding the land of a meddlesome dragon. Arthur's household furniture figures into local topographical folklore throughout Britain as early as the early 12th century, with various landmarks being named "Arthur's Seat," "Arthur's Oven," and "Arthur's Bed-chamber.
The Round Table takes on new dimensions in the romances of the late 12th and early 13th century, where it becomes a symbol of the famed order of chivalry which flourishes under Arthur. In Robert de Boron's Merlin, written around the 1190s, the wizard Merlin creates the Round Table in imitation of the table of the Last Supper and of Joseph of Arimathea's Holy Grail table. This table, here made for Arthur's father Uther Pendragon rather than Arthur himself, has twelve seats and one empty place to mark the betrayal of Judas. This seat must remain empty until the coming of the knight who will achieve the Grail. The Didot Perceval, a prose continuation of Robert's work, takes up the story, and the knight Percival sits in the seat and initiates the Grail quest.
The prose cycles of the 13th century, the Lancelot-Grail cycle and the Post-Vulgate Cycle, further adapt the chivalric attributes of the Round Table. Here it is the perfect knight Galahad, rather than Percival, who assumes the empty seat, now called the Siege Perilous. Galahad's arrival marks the start of the Grail quest as well as the end of the Arthurian era. In these works the Round Table is kept by King Leodegrance of Cameliard after Uther's death; Arthur inherits it when he marries Leodegrance's daughter Guinevere. Difference versions treat the Round Table differently, for instance Italian Arthurian works often distinguish between the "Old Table" of Uther's time and Arthur's "New Table.
The artifact known as the "Winchester Round Table," a large tabletop hanging in Winchester Castle bearing the names of various knights of Arthur's court, was probably created for a Round Table tournament. The current paintwork is late; it was done by order of Henry VIII of England for Holy Roman Emperor Charles V's 1522 state visit, and depicts Henry himself sitting in Arthur's seat above a Tudor rose. The table itself is considerably older, dating perhaps to the reign of Edward I. Edward was an Arthurian enthusiast who attended at least five Round Tables and hosted one himself in 1299, which may have been the occasion for the creation of the Winchester Round Table.