for Athenry and was actively involved in the parliament's affairs in the period leading up to the Irish Rebellion of 1641, including one to England in late 1640.
On the outbreak of hostilities in Connacht, he returned to Galway, becoming involved with figures such as Patrick D'Arcy, Richard Martyn, Ulick Burke, 1st Marquess of Clanricarde and Walter Lynch (mayor).
He was regarded as a leading member of the confederate peace party and involved in friction with papal nuncio, Giovanni Battista Rinuccini.
Arriving in Paris in March 1648, Browne co-operated with a now exiled Ormond in an effort to lay aside religious differences and discussions, which allowed the later to return to Ireland as crown negotiator.
Ormond named him as an agent to treat with Charles, Duke of Lorraine, who had offered the confederates aid against the English parliament.