Mitos, the ongoing series by Greek photographer Michael Pappas, is a compelling ethnographic tribute to the time-honored customs of his homeland.

Portraiture, one of the oldest and most captivating photographic genres, has roots dating back to the earliest days of the medium. Compiling a list of its most significant exponents is a daunting task, but this is what we've endeavoured to do: select what we consider the best portrait photographers of all time, each of whom has left an enduring mark on the style.