On 14 April 1917, Celtic beat Hibernian in Edinburgh by the score of 0-1. The win put a bookend on Celtic's record streak of 62 unbeaten league matches, a streak that started the previous season with a 2-0 home win over Kilmarnock on 20 November 1915.
The streak was a small part of Celtic's overall dominance of the Scottish league of the period, which saw them them win four consecutive league titles from 1915-1918 under manager Willie Maley. Maley was one of the first players signed by Celtic in their inaugural season in 1888 and became their first manager in 1897. He retired in 1940, making him Celtic's longest-serving manager. In those 43 years, Maley helmed Celtic to 30 major trophies, including 16 league titles.
Coincidentally, the team at the front end of Celtic's unbeaten streak - Kilmarnock - ended it on 21 April 1917, beating the Hoops in Glasgow by the score of 0-2.