With the transfer of the headquarters of the diocese from Idanha-a-Velha to Guarda, in 1203, by influence of King Sancho I, it was necessary to promote the construction of a cathedral. Not much is known about the primitive building; however, it is, in fact, known that, in the second half of the 14th century the construction of a new cathedral outside the walled perimeter was considered. The construction of the present cathedral began in 1390 but, given the magnitude of the project, the works dragged and were only finished in the Manueline context.