Abd al-Rahman I
According to the "Chronicon Albeldense", Silo kept peace with the Muslims "ob causam matris", "for his mother's sake". The meaning of this phrase has been debated by scholars. It could mean that his mother was a Muslim with some sort of connection to the Umayyad Emir Abd al-Rahman I, or that she was a hostage of Abd al-Rahman in Córdoba, or it could mean yet something else.