Founded as a monastery by PERSON@1 I , ORGANIZATION@1 in NUMBER@1 , it has served as the principal residence of the Kings and ORGANIZATION@2 since the 15th century .

The Palace of LOCATION@1 , or informally ORGANIZATION@3 , founded as a monastery by PERSON@1 I of LOCATION@2 in NUMBER@1 , has served as the principal residence of the Kings and Queens of LOCATION@2 since the fifteenth century .
