Sisnando Davidiz, Count of Coimbra, July 1064 to 1092. Despite the negative description in the chronicle, Sesnando's rule would bring wealth and a fluorescence of mozarabic culture to Coimbra.
Also known as Sesnando Davides, he was a Mozarab from Tentugal, perhaps of Jewish origin. He was educated in Cordoba and served the Cid in the expedition to Seville. Sisnando was credited with suggesting to Fernando the conquest of Coimbra in 1064, and was rewarded by being made administrator of the town. His mixed background allowed him to keep piece with the Moorish kings. He improved his domain and built numerous new castles at Coimbra, Lousa, Montemor-o-Velho, Penacova and Penela. Under his rule the mozarabic culture reached its high point, just before being destroyed by subsequent Christian kings. His tomb is at Se Velha de Coimbra.
The King then gave Coimbra to the keeping of Don Sisnando, Bishop of Iria; a man, who having more hardihood than religion, had by reason of his misdeeds gone over to the Moors, and sorely infested the Christians in Portugal.