Donnchadh mac Eoghan Ó Duinnshléibhe

Donnchadh mac Eoghan Ó Duinnshléibhe, anglicised as Donough MacOwen O'Donlevy (died 30 September 1527) was an Irish physician. He was the ollam leighis (official physician) of the O'Donnell dynasty from at least 1497 to 1527.

Background
Born in the fifteenth century to a father named Owen, Ó Duinnshléibhe became known for his wealth.

The Ó Duinnshléibhe family were formerly the ruling dynasty of the over-kingdom of Ulaid. By the mid-fifteenth century, they were a hereditary medical family of physicians to the O'Donnells, based in Tyrconnell. Some members of the family went by the surname Ultach, named after Ulaid.

In 1497, Con O'Donnell (son of Chief Hugh Roe O'Donnell) was defeated in battle by Teige Mac Dermot of Moylurg. As the O'Donnell's physician, Ó Duinnshléibhe was taken prisoner by Mac Dermot.

Death and legacy
The Annals of the Four Masters contains Ó Duinnshléibhe's obituary:

Ó Duinnshléibhe had a son, Owen Ultach, who succeeded him as the O'Donnell's ollam leighis.
 * 1527 - The physician O'Donlevy (Donough, son of Owen), a Doctor of Medicine, and learned in other sciences, a man of great affluence and wealth, who kept a house of general hospitality, died on the 30th of September.