Who dated Janet Robertson of Strowan?

Robert Stewart, 1st Earl of Orkney and Lord of Zetland (Shetland) (spring of 1533 – 4 February 1593) was a recognised illegitimate son of James V, King of Scotland, and his mistress Eupheme Elphinstone. Robert Stewart was half-brother to Mary, Queen of Scots and uncle to James VI and I of Scotland and England.