He received the habit of Dominican Order, made profession on 30 April 1609 and was known as Hermano Pedro de Santa Catalina (Br Peter of St Catherine).

Vásquez and Aduarte departed Spain and sailed to the Philippines via Mexico, They arrived in Manila at the end of April 1615.

He was not happy with this apostolate and repeatedly asked to be allowed to go to Japan, as the martyrdom of Alfonso Navarrete, in 1617, had made a profound impression on him.

He marched boldly through three sets of doors guarded by eight sentinels, without being discovered, to reach the imprisoned Christians and administer the Sacraments to them.

After his escape, he met Castellet in Fuchi before proceeding to Inasa, a village in the mountains, where he was unexpectedly arrested on 27 April.

[1] The ashes of these martyrs, whose dead bodies we re-burnt, to prevent them being carried away by the Christians, were cast into the sea, however Castellet managed to secure a small portion of the relics of Vásquez.

In the Roman Catholic Church, his feast day is celebrated on 25 August[7], as well as 10 September, the anniversary of the massacre of 205 Japanese martyrs.