Ochiltree was a signatory to the Congregation's letters to Elizabeth I of England and William Cecil on 19 July 1559.
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His son and heir, Andrew Stewart, known as the Master of Ochiltree, predeceased him in 1578, and he was succeeded by his grandson, Andrew Stuart, 1st Baron Castle Stuart, 3rd Lord Ochiltree.
Cumnock housed many miners, and also served as the market town for the other, smaller towns in the district, like Auchinleck, Lugar, Muirkirk, New Cumnock and Ochiltree (the original Cumnock/Comenagh/Comno/ etc.)
To raise money, in 1615 he resigned the feudal barony of Ochiltree and the peerage to his first cousin, Sir James Stuart, the son of James Stewart, Earl of Arran, younger son of the second Lord Ochiltree.
Earl of Dundonald has a subsidiary of Baron Cochrane of Paisley and Ochiltree
Ochiltree County is the setting for the Hank the Cowdog series of children's books, in the unincorporated city of Twitchell.
Trained by Hall of Fame conditioner Wyndham Walden (founder of Bowling Brook Farm in Carroll County, Maryland), Tom Ochiltree won the Preakness Stakes in the last days of the great match races and the very year the Kentucky Derby and Kentucky Oaks were first run: 1875.