Humanity Dick Martin descended from a branch of the Martin's of Galway who purchased land in Killannin parish, Co. Galway c1592 and became known as the "Martin's of Ross".
The story of Richard Martin, Animal Rights Pioneer, 1754 - 1834 titled "Humanity Dick" the Eccentric Member for Galway by Peter Phillips 2003 may be of assistance.
The Tulira Branch are known as "Martyn". They retained their estate due to the assistance given to British Officers following the Battle of Aughrim nearby. There is an article in the "Old Dublin Society" dated December 11th 1991 on the burial of a Doctor Edward Martyn who as born in Tulira on January 1st 1859 and buried in Glasnevin cemetery, Dublin.
It is titled Edward Martyn the Wealthy Poor.