, ▁when ▁the ▁Doctor ▁first ▁encountered ▁him , ▁attempting ▁to ▁prevent ▁the ▁Norman ▁Con quest ▁as ▁part ▁of ▁a ▁plan ▁to ▁guide ▁England ▁into ▁an ▁early ▁age ▁of ▁techn ological ▁prosper ity . ▁On ▁that ▁occasion ▁he ▁wore ▁the ▁gu ise ▁of ▁a ▁mon k ▁in ▁order ▁to ▁gain ▁the ▁trust ▁of ▁the ▁ 1 1 th - century ▁loc als ▁of ▁North umb ria , ▁hence ▁the ▁name ▁by ▁which ▁he ▁became ▁known . ▁ ▁The ▁Doctor ▁str and ed ▁the ▁Mon k ▁in ▁the ▁ 1 1 th ▁century ▁by ▁ste aling ▁his ▁T ARD IS ' s ▁dimensional ▁controller , ▁which ▁reduced ▁the ▁interior ▁dimensions ▁of ▁the ▁time ▁machine ▁to ▁min usc ule ▁size . ▁The ▁Mon k ▁eventually ▁restored ▁his ▁ship ▁and ▁track ed ▁the ▁Doctor ▁to ▁a ▁vol can ic ▁planet , ▁where ▁he ▁attempted ▁to ▁mar oon ▁his ▁enemy ▁by ▁destroy ing ▁the ▁Doctor ' s ▁T ARD IS ' s ▁lock . ▁The ▁Doctor ▁managed ▁to ▁repair ▁it ▁and ▁next ▁material ised ▁in ▁Egypt , ▁with ▁the ▁Mon k ▁still ▁following ▁him . ▁While ▁there , ▁they ▁encountered ▁the ▁D ale ks , ▁and ▁the ▁Doctor ▁st ole ▁the ▁direction al ▁unit ▁from ▁the ▁Mon k ' s ▁T ARD IS ▁( l ater ▁destroy ing ▁it ▁when ▁he ▁tried ▁to ▁use ▁it ▁in ▁his ▁own ▁ship , ▁as ▁it ▁was ▁in compatible ), ▁causing ▁the ▁Mon k ▁to ▁lose ▁control ▁over ▁his ▁T ARD IS ' s ▁navigation . ▁The ▁Mon k ▁was ▁last ▁seen