John (Fritz) Sumner (13 March 1936, in Blackburn – 2004) was the pre-eminent exploratory climber in his chosen domain of Mid Wales, climbing cutting-edge routes on the remote crags and cliff-faces south of southern Snowdonia starting in the mid-1950s.

• John Sumner (1988). Mid-Wales. Climbers Club. p. 231. ISBN 0-901601-42-X.

• , John Sumner obituary, Colin Wells, The Independent, 13 March 2004

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