Sir Manasseh Masseh Lopes, 1st Baronet (27 January 1755 – 26 March 1831), of Maristow in the parish of Tamerton Foliot, Devon, was a British Member of Parliament and borough-monger.

Meanwhile, Lopes was exerting his influence in various boroughs on behalf of the government, and in 1805 he was created a baronet, with a special remainder to his nephew Ralph Franco,[7] son of his sister Esther.

Meanwhile, at Grampound in Cornwall, although no official protest had been entered against the election result, proceedings had been taken under the criminal law and Lopes was convicted, fined £1000 and jailed for two years.

The Home Secretary, Robert Peel, whose own Oxford University constituency was one of the greatest strongholds of opponents of Catholic Emancipation, felt compelled to resign and fight a by-election to receive a mandate for his change of policy, and was defeated.

This provoked considerable hostile comment, not least because the government had responded to the Anglican establishment voting against them by acquiring a seat from a Jewish-born borough owner.

[9] Lopes was granted a coat of arms blazoned Azure, a chevron or charged with three bars gemelles gules between three eagles rising of the second on a chief of the second five lozenges of the first.