Dom Gualdim Pais (4 March 1118 – 13 October 1195) was a Portuguese crusader, Knight Templar in the service of Afonso Henriques of Portugal.

[1] His family belonged to the rural nobility, originally from Entre-Douro-e-Minho, settled on sowing lands in the Ave River basin on its right bank.

[1] It is known that at a certain point he took up residence in Braga[1] and that he was educated at an ecclesiastical school, possibly that of the Cathedral of Braga[1] and such was his connection with the city that several epigraphs on the castles he founded proclaim him as being from there:[2] e.g. «MAGISTER GALDINUS NOBILI SIQUI / DEM GENERE BRACARA ORIUNDUS[...]».

He was ordained the fourth Grand Master in Portugal of the Order of Knights Templar in 1157, which then was ruled from Braga, where the Archbishop D. Paio Mendes gave them land corresponding today to the Hospital of Saint Marcus.

The famous Round Church of the Castle of Tomar, inspired by similar structures in Jerusalem, was built under his supervision.