In 1428, James I, in his effort to bring the Highlanders to heel, summoned fifty clan chiefs to a parley at Inverness Castle. However, "where the Parliament was at the time sitting, they were one by one by order of the King arrested, ironed, and imprisoned in different apartments and debarred from having any communications with each other or with their followers." Several chiefs were executed on the spot. Among those arrested were Alexander, 3rd Lord of the Isles, and his mother, Mariota, Countess of Ross. Lord Alexander remained imprisoned for twelve months, after which he returned to Inverness with 10,000 men and burnt the town, though he failed to take the Castle. See: Siege of Inverness (1429).