Rosslyn Chapel, formerly known as the Collegiate Chapel of Saint Matthew, is a 15th-century Episcopal chapel located in the village of Roslin in Midlothian, Scotland. The chapel was founded by William Sinclair, 1st Earl of Caithness with a ground-breaking ceremony in 1456. After the Scottish Reformation in 1560, it was largely abandoned but, following a visit by Queen Victoria, it was rededicated in 1862. It was the target of a bombing in 1914 during the suffragette bombing and arson campaign. The interior contains some fine carvings which many historians have sought to interpret.
Since the late 1980s, the chapel has been the subject of speculative theories concerning a connection with the Knights Templar and the Holy Grail, and Freemasonry. It was prominently featured in this role in Dan Brown's bestselling novel The Da Vinci Code (2003) and its 2006 film adaptation. Medieval historians say these accounts have no basis in fact. Rosslyn Chapel remains privately owned.