In the Parliament haldin at Striuiling the XXV. day of Julii, the zeir of God, ane thousand, fyve hundreth, thre scoir and auchtene zeiris (Edinburgh: John Ross, 1579)
That Scots had become the official language of the Scottish court is demonstrated by this publication of the laws and transactions of the Stirling Parliament held in 1579, just after James VI (later also I of England), began to assert his own personal rule after the regency of the Earl of Morton. After the Act of Union of 1707, the usage of Scots declined considerably and gave way to a more standard form of English.
In a volume given by William Platt.