A selection of pictures capturing Ayrton Senna's time at the pinnacle of the sport from his debut in 1984 with Toleman through to that fateful afternoon on May 1st at Imola 20 years ago today...

Senna makes his F1 debut in 1984 with Toleman, finishing second in Monaco - only his sixth F1 race - and third in Portugal, the season finale...
Senna switches to Lotus the following year, appearing behind the wheel of the iconic John Player Special liveried 97T and 98T in 1985 and 1986...
Senna continues with Lotus in 1987 - taking his sixth and final win with the team in Detroit...
McLaren beckons in 1988...
The partnership with Alain Prost soon turns bitter... although the McLaren-Honda MP4/4 proves the class of the field, winning 15 of the 16 races. Senna takes his first F1 Drivers' title...
Senna carries the #1 in 1989, but Prost takes the title - his third - albeit only after a controversial clash in the penultimate race of the season in Japan...
Senna takes title number two in 1990, but another clash in Japan - again with Prost, now at Ferrari, leaves an unsavoury taste...
Senna finally wins in Brazil in 1991, but gearbox problems mean it is no Sunday afternoon drive and he has to be lifted from the car at the finish...
Senna secures his third world title in 1991, winning seven races in total...
Senna has to play second fiddle to Williams and Nigel Mansell in 1992, but does get the better of them in Monaco (pictured) and Hungary...
Senna is frustrated to be unable to fight with Williams again in 1993, although his drive to victory at Donington Park becomes legendary...
Senna moves to Williams in 1994...
The first three races of the 1994 F1 season don't get well for Senna and all end in retirement...
Senna suffers his fatal accident at the San Marino GP on May 1 1994...
The world mourns...
Today, Senna's legend lives on...