[1] In 1437, he was a member of the conciliar commission that reported on the poor governance of the church by Pope Eugene IV.
[1] In the papal conclave of 5 November 1439 he was one of the supporters of Antipope Felix V.[1] Antipope Felix V made him a pseudocardinal on 6 April 1444 in Geneva, offering him the titular church of San Marcello al Corso.
[1] In the consistory of 19 December 1449, Nicholas V made Estaing a cardinal priest, awarding him the titular church of Santa Sabina on 12 January 1450.
[1] Estaing entered Rome on 30 November 1450 and received the red hat the next day.
[1] On 27 June 1453, he was elected Bishop of Fréjus, holding this position until his death.