Henry I Sinclair, Earl of Orkney, Lord of Roslin (c. 1345 – c. 1400) was a Scottish nobleman. Sinclair held the title Earl of Orkney (which refers to Norðreyjar rather than just the islands of Orkney) and was Lord High Admiral of Scotland under the King of Scotland. He was sometimes identified by another spelling of his surname, St. Clair. He was the grandfather of William Sinclair, 1st Earl of Caithness, the builder of Rosslyn Chapel. He is best known today because of a modern legend that he took part in explorations of Greenland and North America almost 100 years before Christopher Columbus. William Thomson, in his book The New History of Orkney,[2] wrote: "It has been Earl Henry's singular fate to enjoy an ever-expanding posthumous reputation which has very little to do with anything he achieved in his lifetime."[3]
Rosslyn or
Roslin Castle, seat of the Sinclairs who were Barons of Roslin, reconstruction image
Henry Sinclair was the son and heir of William Sinclair, Lord of Roslin, and his wife Isabella (Isobel) of Strathearn.[4] She was a daughter of Maol Ísa, Jarl of Orkney. Henry Sinclair's maternal grandfather had been deprived of much of his lands (the earldom of Strathearn being completely lost to the King of Scots).[5]
Sometime after 13 September 1358, Henry's father died, at which point Henry Sinclair succeeded as Baron of Roslin, Pentland and Cousland, a group of minor properties in Lothian.[6]
Although the Norwegian Jarldom of Orkney was not an inheritable position, successive appointments had operated as if it had been. After a vacancy lasting 18 years, three cousins – Alexander de L'Arde, Lord of Caithness; Malise Sparre, Lord of Skaldale; and Henry Sinclair – were rivals for the succession. Initially trialing de L'Arde as Captain of Orkney, King Haakon VI of Norway was quickly disappointed in de L'Arde's behaviour, and sacked him.[6]
On 2 August 1379, at Marstrand, near Tønsberg, Norway, Haakon chose Sinclair over Sparre, investing Sinclair with the Jarldom or Earldom in the Peerage of Scotland.[4][7][8] In return Henry pledged to pay a fee of 1000 nobles before St. Martin's Day (11 November), and, when called upon, serve the king on Orkney or elsewhere with 100 fully armed men for 3 months. It is unknown if Haakon VI ever attempted to call upon the troops pledged by Henry or if any of the fee was actually paid.[6]
As security for upholding the agreement the new jarl left hostages behind when he departed Norway for Orkney. Shortly before his death in summer 1380, the king permitted the hostages to return home.[9] In 1389, Sinclair attended the hailing of King Eric in Norway, pledging his oath of fealty. Historians have speculated that in 1391 Sinclair and his troops slew Malise Sparre near Scalloway, Tingwall parish, Shetland.[6][10]
Sinclair is later described as an "admiral of the seas" in the Genealogies of the Saintclaires of Roslin by Richard Augustine Hay. This refers to his position as the Lord High Admiral of Scotland while in service to the King of Scotland.[11] It is a title he is said to have inherited from his father William Sinclair in 1358 but it's more likely he acquired it much later in life.
It is not known when Henry Sinclair died. The Sinclair Diploma, written or at least commissioned by his grandson states: "...he retirit to the parts of Orchadie and josit them to the latter tyme of his life, and deit Erile of Orchadie, and for the defence of the country was slain there cruellie by his enemiis..." We also know that sometime in 1401: "The English invaded, burnt and spoiled certain islands of Orkney." This was part of an English retaliation for a Scottish attack on an English fleet near Aberdeen. The assumption is that Henry either died opposing this invasion, or was already dead.[5][6]
Henri Santo Claro (Henry St. Clair) signed a charter from King Robert III in January 1404. It is supposed that he died shortly after that although his son did not take the title until 1412. Therefore, he died somewhere between 1404 and 1412, killed in an attack on Orkney, possibly by English seamen.[12][6] Or in an attack from the south.[7]
According to Sir Robert Douglas, 6th Baronet, Sinclair had received the honours of the Orders of the Thistle, Saint Michael (Cockle) and the Golden Fleece.[13] However all these orders were created after Sinclair's death.