Jack Brabham, F1 champion in 1959,
1960 and 1966, won the French Formula Two championship in 1966, but there was no international F2 championship that year.
Senna's relationship with De Angelis soured over the season, as both drivers demanded top driver status within Lotus and, after spending six years at the team,
De Angelis departed for Brabham at the end of the year,
convinced that Lotus were becoming focused around the Brazilian.