Saint Glastian of Kinglassie (or Glastianus, Glascianus; died 830) was a bishop based in Fife who acted as a mediator in the wars between the Picts and the invading Scots.

[2] The monks of St Augustine's Abbey, Ramsgate wrote in their Book of Saints (1921), Glastianus (St.) Bp.

The collect in the Breviary runs in these terms :— "Grant, we beseech Thee, Almighty God, that we, who celebrate the anniversary of blessed Glascianus, Thy confessor and bishop, may, by the inter-cession of his devout prayers, be deemed meet to attain to eternal joys, through our Lord.

He is known in the parish of Kinglassie (or Kinglassin), near Kirkcaldy, of which frequent mention is made in the Register of Dunfermline.—(Bannatyne Club, pp.

)[5]The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints under January 28, St. Glastian, Bishop and Confessor in Scotland

Amidst the desolation which was spread over the whole country, in the last bloody civil war between the Scots and Picts, in which the latter were entirely subdued, St. Glastian was the comforter, spiritual father, and most charitable protector of many thousands of both nations.