▁that ▁the ▁statements ▁rel ating ▁to ▁prim acy ▁were ▁inserted ▁into ▁legit imate ▁pap al ▁letters ▁after ▁Lan fran c ' s ▁day . ▁Most ▁histor ians ▁agree ▁that ▁Lan fran c ▁did ▁not ▁have ▁anything ▁to ▁do ▁with ▁the ▁for ger ies , ▁however ▁they ▁came ▁about . ▁ ▁King ▁William ▁I ▁supported ▁Lan fran c ▁in ▁this ▁dispute , ▁probably ▁because ▁he ▁felt ▁that ▁it ▁was ▁important ▁that ▁his ▁kingdom ▁be ▁represented ▁by ▁one ▁ecc les iast ical ▁province , ▁and ▁this ▁would ▁best ▁be ▁accomplished ▁by ▁supporting ▁the ▁prim acy ▁of ▁Can ter bury . ▁Before ▁conqu ering ▁England , ▁William ▁had ▁ruled ▁the ▁du chy ▁of ▁Norm andy , ▁which ▁correspond ed ▁to ▁the ▁arch di oc ese ▁of ▁Rou en , ▁and ▁the ▁simplicity ▁of ▁control ▁which ▁this ▁allowed ▁the ▁du kes ▁of ▁Norm andy ▁probably ▁was ▁a ▁strong ▁factor ▁in ▁William ' s ▁support ▁of ▁Can ter bury ' s ▁claims . ▁Another ▁concern ▁was ▁that ▁in ▁ 1 0 7 0 – 1 0 7 2 , ▁the ▁north ▁of ▁England , ▁where ▁York ▁was ▁located , ▁was ▁still ▁imper fect ly ▁pac ified , ▁and ▁allowing ▁York ▁independence ▁might ▁lead ▁to ▁York ▁crow ning ▁another ▁king . ▁ ▁Thomas ▁claimed ▁that ▁when ▁Lan fran c ▁died ▁in ▁ 1 0 8 9 , ▁Thomas ' ▁profession ▁la ps ed , ▁and ▁during ▁the ▁long ▁vac ancy ▁at ▁Can ter bury ▁that ▁followed ▁on ▁Lan fran c ' s ▁death , ▁Thomas ▁performed ▁most ▁of ▁the