Cilfynydd-born Iorwerth 'Iorrie' Isaacs was a Welsh dual-code international rugby flanker who played international rugby for Wales. At club level he played rugby union for Cilfynydd, Cardiff, Glamorgan Police, Pontypridd and Penarth; and later rugby league for Wales, and Leeds.
Isaacs was first selected for Wales in their opening game of the 1933 Home Nations Championship.
The match was against England at their national stadium, Twickenham. Wales had failed to win at the ground in their first nine attempts, and the Welsh failure at the ground was known as the 'Twickenham bogey'. Isaacs was placed at open-side flanker, opposite the veteran Tom Arthur who was positioned on the blind side.
In an exciting match Isaacs, along with Turnbull and Arthur, continually spoiled the English scrum.
When Isaacs caused the English half-backs to loose the loose maul, Watcyn Thomas heeled the ball back for Wooller and then Davey to feed Ronnie Boon who scored a Welsh try.
The game ended 7-3, with all the Welsh points scored by Boon, who had also placed a drop goal. Isaacs played just one more international game in the very next match of the Home Nations Championship against Scotland at St Helens, his international career identical to that of Raymond Bark-Jones.
At the start of the 1933/34 season Isaacs left rugby union behind when he 'Went North' switching to the professional rugby league game, joining Leeds RLFC.