http://jmw.dynip.com/Genealogy/. Also called Samuel. Theophilus is listed in the 1735 Dublin Directory and was stationed at Cork Hill. He was Agent for the 2nd Regiment of Foot on the Irish Establishment also at Cork Hill, according to the "List of General and Field Officers as They Rank in the Army 1754," which is in the Library of the British Museum. In "Freeman's journal' of the 13th September 1763 issue, he appears as a Captain, crossing to Ireland by the Holyhead Packet.
He was the first of the name to come to England after the Edict of Nantes was revoked.

In 1769, Theophilus wrote a letter to his son, Thomas, on the occasion of Thomas leaving for his assignment on Prince Edward Island.  Theophilus was in London at the time. It can be found at http://www.islandregister.com/letters/desbrisay1769.html

Magdalene de Vergèze d'Aubussargues, the wife of Théophilus Desbrisay, came from a Huguenot family that has a rather uncertain history, difficult to piece together from the available sources. Probably the most reliable account is that given in the 1911 volume of the Bulletin de la Société de l'Histoire du Protestantisme Français, and this is what I follow here.

The first of this family who became a Protestant was Antoine de Vergèze. His son Claude, married in 1570 to Domergue de Joanis, had a son Nicholas, who, in 1621, was in charge of the fort of Sainte-Anastasie, overlooking the Gardon river (and thus, interestingly, close to Castelnau. Aubussargues is almost exactly halfway between Castelnau and Uzès).

Jean d'Aubussargues, the son of Nicholas, married Bonne de Barjac in 1638, and had a number of children, two of whom, Jacques, the elder, and Jean, are known to have fled France at the time of the Revocation of the Edict of Nantes. It's difficult to know what they did abroad, as they were both usually just called Daubussargues, or Daubessargue, and only sometimes do we also find any other identifying name.

Upon leaving France, Jacques succeeded the Vicomte de Saint-Bonnet as the commander of the Grand Musketeers, in Brandenburg, where he also commanded the Horse Grenadiers, an elite corps formed by the Grand Elector at the same time as the Grand Musketeers, that admitted only those of honourable birth or proven valour. However, by 1698 Jacques was in Ireland, a Colonel in Galway's regiment. He died in Dublin in 1720.

When he left France, Jacques left behind his wife, Madeleine Gasc (the daughter of the co-seigneur de Sanilhac and the consul of Uzès in 1636), and his ten children, to protect their inheritance. She raised their children, who inherited the family wealth, her husband having fled, and finally rejoined her husband in Dublin, in about 1702, where she died sometime after 1714. Apparently, she called herself Madon de Gas. One of the ten children she raised by herself in France was another Jacques, while two of the girls were called Madeleine and Jeanne. I know nothing about any others. It's likely that this younger Jacques was a Captain in Galway's regiment in 1698, the same regiment where his father was a Colonel, although his name isn't given.

Finally, it is this younger Jacques who was, according to family tradition, the father of Magdalene, who married Théophilus Desbrisay. This is, let me emphasise, only tradition, not genealogy. Historically, there is essentially no doubt of the connection between our Madeleine and the other de Vergèze d'Aubussargues; genealogically, there is no specific proof, and is thus technically unacceptable.

Just to add to the confusion, there were at least three Madeleine de Vergèze d'Aubussargues in Dublin at various times. One was the wife of Colonel Jacques, who signed herself Madon de Gas. Another was the Madeleine who married Théophilus Desbrisay, while the third was the wife of Jean de Vergèze d'Aubussargues, the brother of Colonel Jacques. Jean and his wife lived in Dublin for a time, before moving to Switzerland, where they remained for the rest of their lives.

The d'Aubussargues coat-of-arms was De sinople à un lévrier courant à fasce d'argent accolé de gueules bordé d'or accompagné de 4 roses d'argent boutonnées. That is, a dark green background, with a silver running greyhound, collared in red and bordered in gold, surrounded by four silver roses. Very stylish.