This Alexander was born near Oldcastle, in the County Meath, in the year 1722.

He was Generalissimo of his Catholic Majesty's forces, and Inspector-General of the Infantry, etc., etc.

In the year 1786 he employed the Chevalier Thomas O'Gorman to compile for him a history of the House of O'Reilly, for which he paid O'Gorman the sum of L1,137 10.s., the original receipt for which I have in my possession.
"Prom this branch of the O'Reilly family was also descended the illustrious Andrew Count O'Reilly, who died at Vienna in 1832, at the age of 92.

He was General of Cavalry in the Austrian service.

This distinguished man filled in succession all the military grades in the Austrian service, with the exception of that of Field Marshal, and was called by Napoleon '_le respectable General O'Reilly_.' "The eldest son of Myles J.O'Reilly, Esq., is a young gentleman of great promise and considerable fortune.