sentences:  He encouraged fellow member Daniel O'Connell to stand for election at the 1828 Clare by-election.O'Connell's election, in which Mahon played a large role, persuaded the British Government to pass the Catholic Relief Act 1829, which finalised the process of Catholic Emancipation and permitted Roman Catholics to sit in the British Parliament.As a result, when Mahon was elected for Clare at the 1830 general election, he was entitled to take his seat.