In this paper we investigate the image of the $l$-adic representation attached to
the Tate module of an abelian variety defined over a number field. We consider
simple abelian varieties of type III in the Albert classification. We compute
the image of the $l$-adic and mod $l$ Galois representations and we prove the
Mumford-Tate and Lang conjectures for a wide class of simple abelian varieties
of type III.
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