Inishowen, and had been seized by the Crown from the Ó Dochartaigh (O'Doherty) clan in the aftermath of the rebellion of Sir Cathaoir Ruadh Ó Dochartaigh (Sir Cahir Rua O'Doherty), Lord of Inishowen, in 1608. Chichester, as Lord Deputy of Ireland, ensured that the huge Ó Dochartaigh lands in Inishowen were granted to himself. However, very little of this Inishowen estate was ever run directly by the head of the Chichester family; from the early seventeenth century onwards, almost all of this vast estate was sublet by the Chichesters to several lesser landlords, often described as 'middlemen', on very long-term leases. Most of this huge Inishowen estate was eventually sold off by the Chichester family via the Encumbered Estates Court in the 1850s and later in the nineteenth century. When the head of the Chichester family was advanced in the Peerage of Ireland to being an earl in 1647, they took the title Earl of Donegall due to the family's ownership of this vast estate in Inishowen. The head of the family was further advanced in the Peerage of Ireland to being Marquess of Donegall in July 1791. Sir Arthur Chichester, one of the main architects of the Plantation of Ulster, had Belfast Castle largely rebuilt in the early 1610s, mainly in brick. It is almost certain that Chichester had his 'Plantation' castle built on the site of the Gaelic Uí Néill towerhouse. Chichester may even have incorporated parts of the Uí Néill structure into his new castle. However, when in Ulster, Lord Chichester, as he later became, usually resided at Joymount House in nearby Carrickfergus rather than at the 'Plantation-era' Belfast Castle. Lord Chichester had only one child with his wife, a son, who died in infancy. Thus, upon his own death in February 1625, Arthur, Lord Chichester, was succeeded in his estates and properties (but not in the peerage) by his younger brother Edward (1568-1648), who was created The 1st Viscount Chichester later in that same year. The Chichester family (later also known as the Donegall family) were to own the town of Belfast from around 1603 up until the early 1850s, when their Belfast estate was largely broken up and sold off. On the 24 April 1708, the 'Plantation-era' Belfast Castle, which had been built for Lord Chichester, accidentally burnt down, killing three sisters and one servant of The 4th Earl of Donegall (1695-1757). This castle was