Diomedes de Jesús Díaz Maestre (born May 26, 1957 in the corregimiento of La Junta, La Guajira) is a Colombian vallenato singer and composer. He is one of the most widely recognized performers of this musical genre. His well known moniker El Cacique de la Junta was given early in his career by vallenato singer Rafael Orozco Maestre in honor of his birthplace; La Junta. Diomedes was born and raised on a farm called "Carrizal" on the outskirts of La Junta; his father, Rafael Maria Díaz, and his mother, Elvira Maestre, were very poor, something that Diomedes always sought to change.

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