' s ▁brother ▁Brian ▁of ▁Brit t any ). ▁Some ▁of ▁these ▁l ords ▁were ▁powerful ▁riv als . ▁Med ieval ▁Brit t any ▁was ▁far ▁from ▁being ▁a ▁un ited ▁nation . ▁The ▁French ▁king ▁maintained ▁en vo ys ▁in ▁Brit t any , ▁al li ances ▁contract ed ▁by ▁local ▁l ords ▁often ▁over la pped ▁and ▁there ▁was ▁no ▁specific ▁Bre ton ▁conscious ness . ▁For ▁example , ▁Brit t any ▁replaced ▁Latin ▁with ▁French ▁as ▁its ▁official ▁language ▁in ▁the ▁ 1 3 th ▁century , ▁ 3 0 0 ▁years ▁before ▁France ▁did ▁so ▁itself , ▁and ▁the ▁Bre ton ▁language ▁never ▁had ▁any ▁formal ▁status . ▁The ▁foreign ▁policy ▁of ▁the ▁du chy ▁changed ▁many ▁times ; ▁the ▁du kes ▁were ▁usually ▁independent ▁but ▁they ▁often ▁contract ed ▁al li ances ▁with ▁England ▁or ▁France . ▁Their ▁support ▁for ▁each ▁nation ▁became ▁very ▁important ▁during ▁the ▁ 1 4 th ▁century , ▁because ▁the ▁English ▁k ings ▁then ▁started ▁to ▁claim ▁the ▁French ▁throne . ▁ ▁The ▁Bre ton ▁War ▁of ▁Su cc ession , ▁a ▁local ▁episode ▁of ▁the ▁H undred ▁Years ' ▁War , ▁saw ▁the ▁House ▁of ▁Blo is , ▁back ed ▁by ▁the ▁French , ▁fighting ▁with ▁the ▁House ▁of ▁Mont fort , ▁back ed ▁by ▁the ▁English . ▁The ▁Mont fort s ▁won ▁in ▁ 1 3 6 4 ▁and ▁enjoyed ▁a ▁period ▁of ▁total ▁independence ▁until ▁the ▁end ▁of ▁the ▁H undred ▁Years ' ▁War , ▁because ▁France ▁was ▁weak ened