www.bbc.co.uk/programmes/b08pv5fb
With the demise of the Temple 100 in 2000 following several serious accidents, the honour of being the oldest road race on the island of Ireland passed to the Cookstown 100, which was first held as a 30-mile event on Thursday, June 15, 1922. This makes the Cookstown race four months older than the Ulster Grand Prix, which was first held on Saturday, October 14, 1922.
More history of the event can be read at the link below.
www.cookstown100.com/index.php/about/history