 The Chapel of Saint Philip of Jesus ( Spanish : Capilla de San Felipe de <unk> ) was completed during one of the earliest stages of the construction of the cathedral . It is dedicated to Philip of Jesus , a friar and the only martyr from New Spain , who was <unk> in Japan . The chapel is topped with a Gothic @-@ style dome and has a Baroque altarpiece from the 17th century . A statue of the saint is located in a large niche in the altarpiece . The altar to the left is dedicated to Saint Rose of Lima , considered a protector of Mexico City . To the right is an urn which holds the remains of Agustín de <unk> , who briefly ruled Mexico in the 19th century . Next to this chapel is a baptismal font , in which it is believed Philip of Jesus was baptised . 
