He was a Colombian born Prince of the Church and most notably was the President of the Pontifical Commission Ecclesia Dei from 2000 until his retirement in 2009 having served as Prefect of the Congregation for the Clergy from 1996 to 2006.
He was ordained in 1952 and was consecrated Bishop in July 1971.
Cardinal Castrillón was considered papabile in the conclave that followed St John Paul II's death and which saw Cardinal Joseph Ratzinger become Pope Benedict XVI.
The new Pope confirmed him as Prefect of the Congregation for the Clergy and President of the Pontifical Commission Ecclesia Dei and he was a true friend of Traditional liturgy and oversaw the effective delivery of motu proprio Summorum Pontificum.
I was fortunate to meet him in 2015 at the Una Voce General Council where he sat in choir for Vespers and joined us for a dinner that followed.
Requiem aeternam dona ei, Domine, et lux perpetua luceat ei. Requiescat in pace. Amen.