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Isidore Gluckstein (c. 1851–1920) was a director of Salmon & Gluckstein tobacco merchants, and one of the founders of J. Lyons and Co., a restaurant chain, food manufacturing, and hotel conglomerate created in 1884 that dominated British mass-catering in the first half of the twentieth century.^[1]

Isidore Gluckstein was the son of Samuel Gluckstein, the founder of Salmon & Gluckstein.^[1]

He married Rose Cohen (1851–1908). Among their children were:

Sir Samuel Gluckstein (1880–1958)
Lena Gluckstein, who married Harry Salmon
Major Montague Isidore Gluckstein OBE (1886–1958)

^ ^a ^b W. Rubinstein; Michael A. Jolles (27 January 2011). The Palgrave Dictionary of Anglo-Jewish History. Palgrave Macmillan UK. p. 657. ISBN 978-0-230-30466-6. Retrieved 25 November 2016.