Mondego River
The appearance of a second ecclesiastical center on the Mondego River at Coimbra seems to have been a result of the operation of local forces rather than Sisnando's initiative, as an interpolated document of 13 April 1086 suggests. According to a diploma of 1086, when Paternus, Mozarab Bishop of Tortosa, came to Ferdinand I at Santiago de Compostela in 1064 on a mission from Moctadir of Zaragoza, he was approached by Sisnando, who offered him the see of Coimbra.