• June 26, 1488 AD James IV was crowned King of Scotland.
• February 22, 1498/99 AD As Willelmo Laysk de eodem, he is witness to a contract dated February 22, 1498/99 between Johannem Chaumer de Auchcorvy (John Chaumer of Auchcorvy) and Dauid Knox de Auchcorvy (David Knox of Auchcorvy) regarding a marriage between their children. (ao)
• October 9, 1498 AD Willelmo Lesk de eodem (William Leask) was witness to the precept of sasine, dated October 9, 1498, granted by William Hay, Earl of Erroll, in favor of his son, John Hay, of half the lands of Brogane Lesk, in the barony of Slains, co Aberdeen, on the resignation of Agnes Brogan and her son, Thomas Alexander. (an)
• September 9, 1499 AD “Witnessing me, Jhon Cheyne of Esselmont, till be bundyn and oblist, and to be be becumyn men and servand to my lord Erroll for all the days of my lyf, myne allegeans accebtit allenarly to our Soverane Lord and Kyng. Dated at the Chappel of Lasque, 9 September, 1499. Befor thir witnesses, Wilyam Hay of Ardendracht, Mastir Alexander Cabell, Parson of Banchory, and Gylbert Hay.” (ap)
• 1500 AD “By 1500 the Earls of Erroll residing in Old Slains Castle, were a mighty power in the district, and from most of the barons around they held ‘Bands of Manrent,’ so common in Scottish history, and which came to be a source of great trouble to the crown.” (aq)
• April 16, 1504 AD Thomas of Laysk (perhaps another son of William the 5th Chief) had an action in the Court of Session in Newburg, parish of Foveran co Aberdeen, on April 16, 1504 against Alexander Bannerman in Knaven for relief of rent of the third part of the lands of Knaven. Said Thomas Leask undertook to warrend kape and defend Alexander Bannerman in Knaven skaithless and free of maile of the third part of Knavene taken up by him frae the said Alexander insofar as law wile. (ar)
• August 1504 AD As Willelmo Leisk de eodem, William Leask, 5th of Leask, appears in an instrument of sasine, dated in August 1504, granted by William Hay, Earl of Erroll, Constable of Scotland, with consent of his son, Sir William Hay of Capeth, in favour of another son, John Hay, of the lands of Craigiecroft with its mill, and the multures from said earl’s lands of Leysk, Mekil, Artrawchy, and Auchlethen in the barony of Slains, co Aberdeen. Alexander Leask, oldest son of William, appears in the document as Alexander Leisk de eodem, baillie (balivus) of William Hay, Earl of Erroll. (as)
• 1505/1506 AD William Laysk, (second son of Wlliam Leask the fifth Clan Chief) is admitted a burgess of Aberdeen, co of Aberdeen, in 1505/06. (at)
• 1506 AD Richard Leask, grandson of Jamis of Lask, son of William Leask is appointed Exor (executor) to Sir David Sinclair in 1506. (av) Richard Leask, (the grandson of Jamis, son of Thomas) was the progenitor of the Leasks of Shetland. (au) Richard was the oldest son of William. William was the oldest son James or Jamis de Lask.
• November 29, 1507 AD Andrew Gray brought an action against Thomas Leisk in Newburgh on November 29, 1507 for having a violent occupation. (aw)
• February 17, 1509/10 AD As Willelmum Laysk de eodem, William Leask is a member of an inquest, held at the court of Alexander Bannerman of Waterton, sheriff-depute of Aberdeen, at Aberdeen on February 17, 1509/10, to inquire into the lands pertaining to William Johnston on the death of his father, Alexander Johnstone of Johnstone. (ax)
• September 9, 1513 AD Flodden Field: James IV and over 50 Clan Chiefs were killed in one of Scotland’s worst losses to the English.
• September 9, 1513 AD On September 9, 1513 the Leask Clan Chief (William Lask and his son (Alexander Lask) were killed at Flodden Field with their feudal superior William Hay, Earl of Errol and King James IV.(ay) The Earl of Errol fought on King James IV left with the Earls of Crawford and Montrose, between the borders division led by the Earls of Huntly and Home on the extreme left and King James IV who fought in the center. (az)
• 1513 AD Alexander Lask’s younger brother, William Lask, Burgess of Aberdeen, became the 6th Leask Clan Chief as a result of the death of William Lask and his son, Alexander at Flodden. (ba)
• 1513 AD A tack was given to Lord Henry Sinclair’s widow after he died at Flodden Field. (11-page 27)