2014 Tokyo Marathon was the first of the series of events that were held, beginning in which year?
2014 Tokyo Marathon:  An IAAF Gold Label Road Race, it was the first World Marathon Majors event to be held that year and represented the second occasion that the Tokyo race was part of the elite-level marathon series. World Marathon Majors: The Abbott World Marathon Majors, originally known as the World Marathon Majors, is a championship-style competition for marathon runners that started in 2006.
2006