Title: Football in the United Kingdom
Content:  British teams have won the European Cup 13 times in total, joint with Italy and behind Spain. The UK is also the sovereign state with the most clubs to have won it; (Liverpool (6), Manchester United (3), Nottingham Forest (2), Aston Villa (1), and Chelsea (1), from England, plus Celtic (1) from Scotland). British clubs have also been runners-up on eight occasions (Liverpool (2), Celtic (1), Manchester United (2), Leeds United (1), Arsenal (1) and Chelsea (1)) Celtic became the first British club to win the Cup in 1967, beating Italian side Inter who had won 2 of the previous 3 finals 2–1 in Lisbon. The first English team to win the competition was Manchester United, who defeated two-time winners Benfica of Portugal 4–1 at Wembley a year later, in 1968. English teams enjoyed the most successful period when they won the European 
Title: History of the European Cup and UEFA Champions League
Content:  In 1967, Celtic became the first British team to win the competition, coming back from 1–0 down after a Sandro Mazzola penalty to beat Internazionale 2–1 in the Estádio Nacional in Lisbon, with goals from Tommy Gemmell and Stevie Chalmers. The team, which became known as the Lisbon Lions, managed by Jock Stein, were unique as they were all born within 30 miles of Celtic Park in Glasgow. In 1968, ten years after the Munich air disaster, Manchester United became the first English team to win the competition, defeating Benfica in the final 4–1 after extra time at Wembley Stadium in London. Matt Busby, United's manager at the time of the disaster in Munich, survived life-threatening injuries suffered in the crash and was still at the helm for United, and two other Munich survivors played in the game – Bobby Charlton, who scored two goals in the game, and Bill Foulkes.
Title: Sport in the United Kingdom
Content:  which England hosted and won, though clubs in both the Scottish and English domestic leagues have had success in European club competitions, most notably the UEFA Champions League or its predecessor the European Cup. Glasgow's Celtic won the 1966-67 European Cup, becoming the first British team to do so, with a team composed entirely of players born and raised within the local area around the club's stadium, while the following year, Manchester United became the first English club to win the competition, 10 years after the team had been the victim of a notorious air disaster in Munich while playing in the same competition. Liverpool, with 6 wins, is the most 
Title: 1966–67 European Cup
Content:  The 1966–67 season of the European Cup football club tournament was won by Celtic for the first time in the final against Internazionale, who eliminated defending champions Real Madrid in the quarter-finals, making them the first British team in history to win the trophy. The Soviet Union entered its champion for the first time this season.
Title: 1956 in the United Kingdom
Content:  Kingdom. However, the idea is rejected by Anthony Eden. ; 12 September – Manchester United become the first English team to compete in the European Cup, a competition for the champions of domestic leagues across Europe, when they play the first leg of the preliminary round in Belgium and beat R.S.C. Anderlecht 2–0. ; 25 September – The TAT-1 transatlantic telephone cable between the UK and North America inaugurated. ; 26 September – Manchester United qualify for the first round of the European Cup in style with a 10–0 win over R.S.C. Anderlecht at Maine Road in the second leg of the preliminary 
Title: Celtic F.C. in European football
Content:  The first officially sanctioned European club tournament, the European Champion Clubs' Cup, was launched in 1955. Conceived by Gabriel Hanot, the editor of L'Équipe, as a competition for winners of the European national football leagues, it is considered the most prestigious European football competition. Hibernian were amongst the 16 sides invited to take part in the tournament's first season, and they became the first British club to participate in European club competition. Rangers took part in the tournament the following season as champions of Scotland. The Inter-Cities Fairs Cup was also established at the same time, and in 1960 Hibernian became the first Scottish club to participate, eliminating Barcelona en route to the semi-final, where they lost to Roma. The 1960–61 season was also the inaugural year of the European Cup Winners' Cup, with Rangers reaching the final. They were comfortably beaten over two legs by Fiorentina, but were still the first British club to reach a UEFA sanctioned European club final.
Title: Paul Lambert
Content:  became the first British person to win the European Cup with a non-UK team, and the first British person to win the tournament since its reformation as the Champions League in 1992. It was announced the Champions League group stage game on 5 November 1997 against Parma, his 23rd in European club competitions, would be Lambert's last before he returned to Scotland. He was given a rousing send off by the Dortmund fans, and reciprocated with a banner he had prepared thanking the Dortmund fans for their support. Lambert scored one domestic league goal during his time with Dortmund, against Bayer Leverkusen.
Title: Bill Foulkes
Content:  29 May 1968. Up against Benfica, Foulkes started the match in central defence. As the match entered extra time, the scoreline was 1–1, with the United goal coming from Charlton. Then, Best, Brian Kidd and Charlton scored a goal each, and United triumphed 4–1, becoming the first English team to win the European Cup. 10 years after the Munich air disaster, Foulkes had finally won a European Cup winners medal at the age of 36. Foulkes later said that winning the Cup helped him to "get over the crash". He and Charlton were the only players left at the club from the time of the disaster. Indeed, all of the other survivors except Harry Gregg (who remained at Old Trafford until 1966) had left the club within four years of the disaster.
Title: Manchester United F.C. in European football
Content:  Manchester United Football Club is an English football club based in Old Trafford, Greater Manchester. They were the first English club to enter European competition, entering the European Cup in 1956. Since then, the club has competed in every UEFA-organised competition, with the exception of the now-defunct Intertoto Cup. The competition in which the club has had the most success is the European Cup (now known as the UEFA Champions League); they have won three European Cups, the first of which came in 1968; this win made them the first English club to win the European Cup. The other two victories 
Title: 1966–67 in Scottish football
Content:  A number of significant events occurred during the season. The domestic campaign was dominated by Celtic, who along with winning all 5 tournaments they entered, became the first British team to win the European Cup; the great Celtic team who achieved this were later nicknamed the Lisbon Lions. 1966–67 was arguably Scottish football's best ever season in European football, with Rangers reaching the final of the Cup Winners Cup and Kilmarnock reaching the Fairs Cup semi-finals. In addition, Dundee United marked their European debut by eliminating Fairs Cup holders Barcelona. It was also a season in which the Scottish national team recorded one of their most celebrated victories, beating greatest rivals and World Cup holders England 3–2 at Wembley in the British Home Championship. The season also marked the league debut of Clydebank, while it was the final appearance of Third Lanark, one of the founding members of the SFA and Scottish League, who went out of business in the summer of 1967.

Question: who was the first british team to win the european cup?
Answer: Celtic.