Richard Cassels (1690 – 1751), also known as Richard Castle, was an architect who ranks with Edward Lovett Pearce as one of the greatest architects working in Ireland in the 18th century. Cassels was born in 1690 in Kassel, Germany. Although German, his family were of French origin and descended from the French-Netherlandish 'Du Ry' family, famous for the many architects among their number. A cousin Simon Louis du Ry designed Schloss Wilhelmshöhe in Kassel. Early work Richard Cassels, who originally trained as an engineer, came to Ireland in 1728 at the behest of Sir Gustavus Hume of County Fermanagh to design for Hume a mansion on the shores of Lower Lough Erne. Hume had probably discovered Cassels working in London where he was influenced by the circle of architects influenced by Lord Burlington. Cassels, soon after arrival in Ireland, established a thriving architectural practice in Dublin. Architecturally at the time Dublin was an exciting place to be – Edward Lovett Pearce, also newly established in the city, was working on Castletown House, the great mansion of Speaker William Conolly, and the new Irish Houses of Parliament simultaneously. Both of these buildings were designed in the newly introduced Palladian style. Palladian architecture was currently enjoying a revival that was to sweep across Europe and be adopted with fervour in Ireland. Cassels was well versed in the concepts of Palladio and Vitruvius, but was also sympathetic to the more Baroque style of architecture. In Dublin itself, Cassels worked on the Houses of Parliament with Pearce, his mentor and friend. Cassels' first solo commission was the Printing House of Trinity College, designed to resemble a temple complete with a doric portico. This portico was an interesting feature symbolising Cassels' early work – a portico is an almost essential feature of Palladian architecture. But as Cassels' work matured he tended to merely hint at a portico by placing semi-engaged columns supporting a pediment as the focal point of a facade. Perhaps he felt the huge Italian porticos that provided shelter from the sun were not requisite for houses in the less clement Ireland. This blind, merely suggested, portico is a feature of his final Dublin masterpiece Kildare House (later renamed Leinster House), built for The 20th Earl of Kildare (later created The 1st Duke of Leinster) between 1745 and 1751. In 1741 he designed the Bishop's Palace which is now part of Waterford