The Convento de São Francisco is one of the oldest and historically most significant buildings in Santarém. Founded in 1242 by King Sancho II, it served as a royal pantheon for several generations of Portuguese kings and contained many important medieval tombs, several of which were later moved to Lisbon's Mosteiro dos Jerónimos.
The complex now houses a mix of municipal uses. Part of it is an arena used for bullfighting and events. The Gothic church remains and is occasionally open for visits — the carved stone elements and the remnants of royal funerary sculpture that remain here are worth seeing. The entire complex is a useful illustration of how medieval Portugal treated its royal heritage, and how the 19th century dismantled much of it.