Sloane was born into a family of partial
Ulster-Scots descent on 16 April 1660 at
Killyleagh, a village on the south-western shores of
Strangford Lough in
County Down in
Ulster, the northern
province in
Ireland. He was the seventh and last child of Alexander Sloane, who died when Hans was six years old. Alexander Sloane was a collector general of taxes for County Down and an agent for the
Earl of Clanbrassil. His brother, James Sloane, was a Member of the Irish Parliament. It is said that Sarah Hicks (Hans's mother) was an Englishwoman who moved to Killyleagh as Anne Carey's companion when Anne married Lord Clanbrassil. Sloane's paternal family were
Ulster-Scots, having migrated from
Ayrshire in the south-west of
Scotland; they settled in east Ulster during the
Plantation of
Antrim and
Down, which was slightly separate from the wider
Plantation of Ulster, under
King James VI and I. The Sloane children, including Hans, were taken up by the Hamilton (or Clanbrassil) family and had much of their early tuition within the
Killyleagh Castle library. Out of Alexander's sons, only three reached adulthood: Hans, William, and James. The graveyards of Henry and John Sloane can be found in Killyleagh's churchyard; both brothers died in their childhood. The eldest brother James was elected a Member of Parliament for
Roscommon and Killyleagh in 1692. John Sloane later became an MP of
Thetford and a barrister of the
Inner Temple, spending most of his time in London. Like many other Scots "
Planters" in Ulster during the seventeenth century, the Sloane name was almost certainly of
Gaelic origin, Sloane probably being an anglicisation of
Ó Sluagháin. As a youth, Sloane collected objects of natural history and other curiosities. This led him to the study of medicine, which he did in London, where he studied botany,
materia medica, surgery and pharmacy. His collecting habits made him useful to
John Ray and
Robert Boyle. After four years in London he travelled through France, spending some time at
Paris and
Montpellier, and stayed long enough at the University of Orange-Nassau to take his MD degree there in 1683; he was hired as an assistant to prominent physician
Thomas Sydenham who gave the young man valuable introductions to practice. He returned to London with a considerable collection of plants and other curiosities, of which the former were sent to Ray and utilised by him for his
History of Plants. == Voyage to the Caribbean ==