He died in
London on 6 May 1822, aged 67, as a result of having accidentally taken an improper medicine. He was buried at his family's seat,
Luton Hoo in
Bedfordshire. Beneath it is the following
Latin inscription: :
M. S. / Reverendissimi in Christo patris / GULIELMI STUART, S T P. / per annos xxii hujusce Ecclesiæ / Archiepiscopi. / Hoc monumentum / Clerici Armachani / pio functi munere / posuerunt. / Obiit anno salutis MDCCCXXII / Ætat. Suæ Ixviii. :In sacred memory of the most reverend father in Christ, William Stuart
STP, for 22 years archbishop of this church. The clergy of Armagh, making a pious offering, placed this monument. He died in the year of grace 1822, in the 68th year of his age. ==References==