Tretze (1986-2018) was born in Barcelona (Spain). After a past linked to drawing, which he learnt as a self-taught artist, he entered the world of graffiti in 2003. He has participated in many events related to urban art in Spain and around the world.

He has been working as a freelance illustrator in Barcelona for many years. His style, halfway between photo realism and expressionism, gives him freedom in both drawing and colour.