Osbert was opposed to the election of William fitzHerbert as Archbishop of York and supported William 's rival and successor Henry Murdac . Although he remained a supporter of Murdac after 1147 , he did oppose Murdac 's interventions in Selby Abbey , where Murdac had deposed one abbot and appointed another . In 1153 , Osbert deposed Murdac 's choice as abbot of Selby and appointed another abbot . Originally , Osbert had supported Elias Paynel , Murdac 's choice for abbot , but then changed his stance and helped with the deposition .