what are the names of all the bishops?
geir vidalin, steingrimur jonsson, helgi thordersen, 'petur petursson, hallgrimur sveinsson, thorhallur bjarnarson, jon helgason, sigurgeir sigurdsson, asmundur gudmundsson, sigurbjorn einarsson, petur sigurgeirsson (son of sigurgeir, olafur skulason, karl sigurbjornsson (son of sigurbjorn ein, agnes sigurdardottir
what bishop has the longest tenure?
asmundur gudmundsson