The Alexiad was written c. 1148 by Byzantine Princess Anna Komnene. It is a historical text detailing the political and military life of her father, Alexios I, including his interactions with the crusades. This image is of fol. 1r, but the entire manuscript can be seen here: http://mss.bmlonline.it/s.aspx?Id=AWOItwHyI1A4r7GxMMRx&c=Alexias%20historia%20filii%20Alexii%20rom.%20imp#/book