On 19 December 1832 he entered parliament in the Liberal interest, as one of the members for Meath, and continued to represent that constituency till January 1840, when he was appointed first assistant-registrar of deeds for Ireland, at a salary of £1,200 a year, a place which he held till 1868. In politics he was never in perfect accord with his father, and his retirement from parliament was probably caused by his inability to accept the Repeal movement. During his parliamentary career he fought a duel with Lord William Arden, 2nd Baron Alvanley, a captain in the British Army, at Chalk Farm, on 4 May 1835. A challenge had been sent by Alvanley to O'Connell's father, who, in accordance with a vow he had made after shooting D'Esterre, declined the meeting. Morgan thereupon took up the challenge. Two shots each were exchanged, but no one was hurt. He afterwards, in December 1835, received a challenge from Benjamin Disraeli, in consequence of an attack made on Disraeli by Morgan's father. Morgan declined to meet Disraeli.