[2] In the early 15th century, she married Calbhach Ó Conchobhair Failghe (Calvach O'Connor Faly, d. 1458), chief of Uíbh Fhailghe (anglicized as Offaly).
[6] In an obituary for Margaret found in a seventeenth-century translation of a set of Irish annals, Duald Mac Firbis provides more elaborate details as to the events of these two feasts.
[7] According to Mac Firbis, 2,700 people were entertained at the first feast and 'Maelyn O'Maelconry one of the chiefe learned of Connaght, was the first written in that Roll and first payed and dieted or sett to super'.
[2][7] In addition to her pilgrimage, Margaret commissioned the making of a number of roads, bridges, churches and missals in order 'to serve God and her soule'.
[1][7] On her way back from Santiago de Compostela in 1445, Margaret also managed to negotiate a prisoner exchange between the Gaelic Irish and their English neighbors in Meath.
A number of Gaelic Irish, including Mac Eochacáin of Cenél Fiachach, his son and Art Ó Máelachain's grandson, had been taken prisoner by the English while in the company of the Baron of Dealbhna.
In order to secure their freedom, Margaret released a number of English prisoners being held by her husband and brought them to Trim Castle to make the exchange.
Elizabeth Owens Blackburne, author of the romanticized book Illustrious Irishwomen (1877), described Margaret as a '...high-bred and high-spirited gentle-woman' and a 'woman of remarkable spirit and capacity'.