Trinity Chapel Edinburgh

Mary of Guelders (c. 1434–1463), Queen consort of Scotland, founded the Trinity Collegiate Church in 1460 in memory of her husband, King James II, who was killed that year at the siege of Roxburgh Castle. Founded as a religious and charitable institution, which included the church and an adjoining almshouse (Trinity Hospital) for 13 poor individuals.Architecture: It was considered a "magnificent and sumptuous" example of 15th-century Gothic architecture, often called the most accomplished building of its time in Scotland. It was demolished in 1848 to make way for Waverly Station.

Many stones were numbered and stored with the intention of rebuilding the church. After decades of delay, a portion of the stones was used to construct Trinity Apse on Chalmers Close in 1870, which is now a Grade A listed building.During the 1848 demolition, remains thought to be Mary of Guelders were discovered and eventually re-interred in Holyrood Abbey.

The church's original Trinity Altarpiece is displayed in the National Gallery of Scotland. 

There is an exhibition starting in the Museum of Edinburgh on the High Street. The exhibition follows a two-year project led by Jill Harrison, founder of the Trinity Network, to trace and catalogue medieval stones dispersed across Edinburgh after the church was torn down. 

The exhibition also examines the rediscovery of three carved stone bosses donated by NHS Lothian which later ended up at the Astley Ainslie Hospital.

A programme of free talks and guided walks will accompany the exhibition during its run at the Museum of Edinburgh.

James iI and Mary of Guelders as portrayed in the Seton Armorial of 1591.