▁including ▁those ▁by ▁William ▁Wor c ester , ▁John ▁L eland , ▁and ▁Nicholas ▁Ros car rock . ▁The ▁number ▁of ▁children ▁attributed ▁to ▁him ▁var ies ▁from ▁twelve ▁to ▁si xty - three , ▁the ▁number ▁most ▁frequently ▁encountered ▁being ▁twenty - four . ▁There ▁are ▁two ▁main ▁lists ▁however , ▁one ▁of ▁Wel sh ▁origin ▁and ▁one ▁of ▁Corn ish ▁origin . ▁Most ▁of ▁his ▁children ▁appear ▁to ▁have ▁travel led ▁from ▁Bre con ▁to ▁evangel ise ▁Corn wall ▁and ▁North ▁Dev on , ▁where ▁they ▁are ▁now ▁v ener ated , ▁but ▁there ▁is ▁little ▁agreement ▁between ▁the ▁two ▁lists . ▁ ▁The ▁number ▁of ▁Bry chan ' s ▁children ▁may ▁have ▁grown ▁over ▁time , ▁as ▁more ▁and ▁more ▁sec ular ▁people ▁as ▁well ▁as ▁sain ts ▁wished ▁to ▁claim ▁descent ▁from ▁one ▁of ▁the ▁" H oly ▁Famil ies ▁of ▁Britain ". ▁List ed ▁below ▁are ▁children ▁from ▁Wel sh , ▁Corn ish , ▁Irish , ▁and ▁Bre ton ▁sources : ▁ ▁S ons ▁in ▁Wel sh ▁sources ▁The ▁sons ▁listed ▁in ▁the ▁C og na cio ▁Bry chan , ▁De ▁Situ ▁Bre chen ia uc ▁and ▁the ▁gene alog ies ▁of ▁Jesus ▁College ▁MS ▁ 2 0 ▁are ▁C yn og , ▁Rh ain ▁D rem r ud d , ▁C ly dw yn , ▁Ar then , ▁Pap ai , ▁D ing ad , ▁Ber w yn ▁and ▁Rh yd og . ▁Also ▁listed , ▁but ▁not ▁in ▁all ▁three , ▁are ▁C yn on ,