Which German footballer was nicknamed 'Der Kaiser'?

Franz Anton Beckenbauer (born 11 September 1945) is a German former professional footballer and manager. Early in his playing career he was nicknamed Der Kaiser ("The Emperor") because of his elegant style, dominance and leadership on the field, and also as his first name "Franz" is reminiscent of the Austrian emperors. He is widely regarded to be one of the greatest players in the history of the sport.A versatile player who started out as a midfielder, Beckenbauer made his name as a central defender. He is often credited as having invented the role of the modern sweeper.

Twice named European Footballer of the Year, Beckenbauer appeared 103 times for West Germany and played in three FIFA World Cups. He is one of only two men, along with Brazil's Mário Zagallo, to have won the World Cup as a player and as a manager; he lifted the World Cup trophy as captain in 1974, and repeated the feat as a manager in 1990. He was the first captain to lift the World Cup and European Championship at international level and the European Cup at club level. He was named in the World Team of the 20th Century in 1998, the FIFA World Cup Dream Team in 2002, and in 2004 was listed in the FIFA 100 of the world's greatest living players.