Celtic F.C. their sixth successive league title on 2 April 2017, with a record eight league games to spare. As Celtic's unbeaten domestic run continued, they subjected Rangers to their heaviest defeat at Ibrox since 1915, 5–1, on 29 April. Celtic's 2–0 win over Hearts on 21 May saw them finish 30 points ahead of second-placed Aberdeen in the league, with a record 106 points, and the team became the first Scottish side to complete a top-flight season undefeated since Rangers in 1899. On 27 May 2017, Celtic clinched their fourth treble by defeating Aberdeen 2–1 in the Scottish Cup final. The
History of Celtic F.C. (1887–1994) this run of league championships, Celtic went 62 matches unbeaten from 20 November 1915 until 14 April 1917, a record in British football that stood for 100 years, until broken by Celtic themselves in November 2017. However, Celtic's time during World War I was mixed, although they enjoyed great success on the pitch. Football was not as important; attendances fell, player's salaries were reduced and there was increased pressure to complete the fixture list. On one occasion in 1916, during their 62 match unbeaten run, Celtic had to play two matches on the same day against Raith Rovers and Motherwell,