The post office was established in 1828, the Anglican church, St Stephens, was opened and consecrated 16 July 1839 followed by the Catholic Church, St Nicholas of Myra, in 1850. Two other prominent Penrith pioneers were Irish-born Thomas Jamison (1752/53-1811), a member of the First Fleet and surgeon-general of New South Wales (after whom Jamisontown is named), and his son, the landowner, physician and constitutional reformer Sir John Jamison (1776–1844). In 1824, Sir John erected the colony's finest Georgian mansion, Regentville House, near Penrith, on a ridge overlooking the Nepean River. Sir John established an impressive agricultural estate at Regentville and became a Member of the New South Wales Legislative Council. His grave can be seen in St Stephen's graveyard. Regentville House burned down in 1868 but most of its stonework was salvaged and used for building projects in and around Penrith.