The three founders were soon joined by William Michael Rossetti, James Collinson, Frederic George Stephens and Thomas Woolner to form a seven-member "brotherhood".
The group's intention was to reform art by rejecting what they considered to be the mechanistic approach first adopted by the Mannerist artists who succeeded Raphael and Michelangelo. They believed that the Classical poses and elegant compositions of Raphael in particular had been a corrupting influence on the academic teaching of art. Hence the name: Pre-Raphaelite. source : wikipedia