Constantine does appear in some medieval works. In Jean d'Outremeuse's 14th-century "Ly Myreur des Histors", Lancelot installs Constantine on the throne after Arthur's death. He is king of Britain in some versions of the Havelok the Dane legend, beginning with Geoffrey Gaimar's 12th-century "Estoire des Engleis". He is also mentioned as Arthur's successor in the 14th-century English alliterative poem known as the Alliterative "Morte Arthure", following Arthur's war with the Romans and his subsequent mortal battle with Mordred. Other English romances that reference Constantine in passing include the 14th-century "The Awntyrs off Arthure" and "Sir Gawain and the Carle of Carlisle", written around 1400. Jorge Ferreira de Vasconcelos's 16th-century Portuguese novel "Memorial das Proezas da Segunda Távola Redonda" fuses Constantine with the ubiquitous Round Table knight Sagramore, creating "Sagramor Constantino", Arthur's son-in-law and heir. As king, he forms a new Round Table to defeat the old enemies and continue the glory of Arthurian Britain. Constantine's relation to Arthur varies widely in these later works. Many works leave it unstated, while others follow the chronicles in making Constantine Arthur's nephew. Several romances, especially English works, cast him as Arthur's grand-nephew, with Cador being the son of a (generally unnamed) sister of the king.