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. (1994–present) Celtic as they retained the Scottish Cup, defeating Dundee United 1–0 in the final. At the end of the season, Martin O'Neill parted ways with the club, to care for his ill wife. Under O'Neill's five year leadership, Celtic won the league three times, three Scottish Cup finals and the League Cup once. In European competition, teams such as Juventus, Porto, Valencia, and Barcelona all visited Glasgow to face Celtic and returned home defeated. He led Celtic to their first European final in 33 years, albeit losing narrowly after extra time. Celtic also commenced an unbeaten run of 77 home