▁people ▁do ▁not ▁even ▁know ▁the ▁word ▁" G allo " ▁and ▁have ▁no ▁idea ▁that ▁it ▁has ▁writing ▁systems ▁and ▁publications . ▁ ▁The ▁Gal lo ▁community ▁is ▁estimated ▁at ▁between ▁ 2 8 , 3 0 0 ▁and ▁ 2 0 0 , 0 0 0 ▁speak ers . ▁The ▁language ▁is ▁taught ▁on ▁a ▁non - comp uls ory ▁basis ▁in ▁some ▁schools , ▁high - sch ools ▁and ▁univers ities , ▁particularly ▁in ▁Il le - et - V ila ine . ▁ ▁Religion ▁ ▁Bret ons ▁are ▁mainly ▁Catholic ▁and ▁the ▁Christian isation ▁occurred ▁during ▁the ▁Roman ▁Ga ul ▁and ▁Frank ▁era . ▁During ▁the ▁Brit on ▁em igration ▁to ▁Brit t any , ▁several ▁Christian ▁mission aries , ▁mostly ▁Wel sh , ▁came ▁in ▁the ▁region ▁and ▁founded ▁dioc eses . ▁They ▁are ▁known ▁as ▁the ▁" Se ven ▁founder ▁sain ts ": ▁ ▁Pa ol ▁A or elian n , ▁at ▁Saint - Pol - de - L éon , ▁ ▁T ud wal , ▁at ▁Tr ég u ier , ▁ ▁Br ieg , ▁at ▁Saint - B rie uc , ▁ ▁Mal o ù , ▁at ▁Saint - M alo , ▁ ▁S ams un ▁of ▁Dol , ▁at ▁Dol - de - B ret agne , ▁ ▁Pad arn , ▁at ▁V annes , ▁ ▁Ka our int in , ▁at ▁Qu imper . ▁ ▁Other ▁notable ▁early ▁mission aries ▁are ▁G ild as ▁and ▁the ▁Irish ▁saint ▁Col um ban us .