Background

Deidara was originally from Iwagakure although he readily abandoned the village for the opportunity of using his "art" more frequently, as his village ridiculed him for it. Deidara became an assassin bomber for hire, not caring who he worked with as long as he could use his artwork.
Sometimes after orochimaru left Akatsuki,Deidara was located by itachi, kisame and sasori,who were under the ordersof the leader,pain, to recruit him. Deidara refused at first, resulting in Itachi challenging him, promising to leave him alone if Deidara won. Deidara willingly accepted Itachi's challenge, but was easily defeated by Itachi's sharingan,and joined Akasuki.Deidara, having taken a huge blow to his ego, carried a murderous loathing for Itachi and other Uchiha for the rest of his life, although he was intelligent enough to recognize Itachi as a more powerful opponent. However, he did take steps during his time with Akatsuki to get revenge on Itachi, such as training his left eye to counter Genjutsu.