[5] On 14 November 1583, after the death of his father, he returned from France and was taken to meet King James VI of Scotland at Kinneil House.

[8] In December the king issued instructions for Ludovic's education and placed him in the royal household under the care of Mr Gilbert Moncreiff.

On 23 December 1583 he was appointed as the High and Great Chamberlain of Scotland and first Gentleman of the King's Bedchamber, as his father had been, with Alexander Erskine of Gogar, Captain of Edinburgh Castle as his deputy.

The role included taking oaths of fidelity to the King from the other officers, ushers, and varlets of the Bedchamber and Wardrobe.

[9] On 4 October 1590 he played cards with the king for the stake of a new "black castor hat lined with velvet".

James wanted him to marry a daughter of the Earl of Morton or Arbella Stewart and had Lilias Ruthven shut up in Wemyss Castle.

[12] After the death of Lilias Ruthven in May 1592, the English diplomat Robert Bowes heard that the king often received Lennox in his bed when he was away from the court and his queen Anne of Denmark.

[17] In 1591 he was appointed to the post of Lord High Admiral of Scotland following the disgrace of Francis Stewart, 5th Earl of Bothwell.

Lennox arrested Michael Balfour of Burleigh and John Wemyss of Logie on 8 August 1592 on suspicion of conspiracy with Bothwell.

The two groups of attendants fired on each other with pistols and John Graham and Sir Alexander Stewart, a companion of the duke, were killed.

[19] On 6 May 1593 the Duke and 15 friends subscribed to a frivolous legal document swearing to abstain from wearing gold and silver trimmings on their clothes for a year,[20] and the defaulters were to pay for a banquet for all at John Kinloch's house.

[21] As Great Admiral of Scotland, on 12 October 1593 Lennox gave Daniel Leyne a warrant to seize a ship captained by James Keeler of London, which was loading salt at Prestonpans.

[22] Soon after, as Lennox was now out of favour with James VI, he went to St Andrews in October 1593 and considered returning to France.

[28] Several members of his retinue were also made burgesses, including Sir Robert Melville of Murdocairny and David Moysie secretary-depute to the king.

[34] Lennox joined with the "Gentleman Adventurers of Fife" in a controversial project to resettle the Isle of Lewis.

[40] In November 1603 the Spanish ambassador, the Count of Villamediana, invited the Duke of Lennox and the Earl of Mar to dinner, and according to Arbella Stuart asked them "to bring the Scottish ladies for he was desirous to see some natural beauties".

[44] Lennox's cousin, the Marquise de Verneuil, was under house arrest in Paris, and was moved to different lodging far from the Duke's apartments.

[45] In July 1606 Lennox was sent to Gravesend to welcome Christian IV of Denmark-Norway, the younger brother of the queen Anne of Denmark, to England.

[47] In 1605 King James granted Lennox a patent for the "New Draperies" which had been resigned by Sir George Delves and William Fitzwilliam.

[50] On 9 February 1608 he performed in the masque The Hue and Cry After Cupid at Whitehall Palace as a sign of the zodiac, to celebrate the wedding of John Ramsay, Viscount Haddington to Elizabeth Radclyffe.

As part of the Plantation of Ulster, in 1608 Lennox was granted lands at Portlough in the Barony of Raphoe in County Donegal.

The Pynnar Survey of 1618 records Lennox as the chief undertaker for 2,000 acres in the Portlough area and as represented locally by his agent Sir Aulant Aula.

[55] King James VI of Scotland had discussed with Thomas Fowler the possibility of the Duke marrying Arbella Stuart, but the scheme was not proceeded with.

Lennox also had a son with a mistress whose name is unknown: Stewart died suddenly in bed in his lodging at Whitehall Palace on the morning of 16 February 1624 aged 49 without a legitimate male issue.