Final answer:
The first history of the kings of the British people written in 1138 with a focus on Arthur is thought to be Geoffrey of Monmouth's 'Historia Regum Britanniae.' While not explicitly mentioned in the provided references, Geoffrey's work is crucial for understanding medieval British history and the Arthurian legend.
Step-by-step explanation:
The first history of the kings of the British people written in 1138 that dedicates a significant portion to the life of King Arthur is not directly described in the provided reference materials, but likely refers to Geoffrey of Monmouth's Historia Regum Britanniae (History of the Kings of Britain). This seminal work is noted for its blend of historical fact and Arthurian legend. While Geoffrey of Monmouth's work predates the reference timeframe and is not explicitly mentioned in the provided sources, it has played a crucial role in shaping the narrative of British history and is widely considered a key source for medieval European studies.
The provided references cover a range of events and manuscripts relevant to historical studies, such as the life of Akhnaton, the works of Anselm Adorne, Queen Blanche of Castile, and aspects of Medieval English history, such as the creation of the Lindisfarne Gospels by Eadfrith. The topics included in the references also span historical methodologies, including historiography and the production of manuscripts, while not directly relating to Geoffrey's work. Nonetheless, Geoffrey's Historia Regum Britanniae is a crucial text for those researching medieval British history and the legend of King Arthur, particularly for its influence on subsequent literature and the portrayal of British royal lineage.