born ▁about ▁ 1 6 8 0 ) ▁was ▁a ▁leader ▁of ▁the ▁Er v ip i ame ▁during ▁the ▁ 1 8 th ▁century ▁and , ▁at ▁least ▁by ▁Spanish ▁standards , ▁the ▁overall ▁leader ▁of ▁the ▁Ran cher ia ▁Grande , ▁a ▁large ▁and ▁numerous ▁collection ▁of ▁Native ▁American ▁tribes ▁between ▁the ▁Bra zos ▁River ▁and ▁the ▁Colorado ▁River ▁in ▁what ▁is ▁today ▁eastern ▁Texas . ▁ ▁El ▁Cu il ón ▁was ▁born ▁in ▁what ▁is ▁today ▁Co ahu ila , ▁probably ▁between ▁the ▁Rio ▁Grande ▁and ▁the ▁Rio ▁Sal ado . ▁ ▁He ▁spent ▁some ▁time ▁at ▁Mission ▁San ▁Francisco ▁V izar ron ▁in ▁about ▁ 1 6 9 9 ▁before ▁moving ▁north - east ward ▁to ▁join ▁other ▁Er v ip i ame ▁who ▁had ▁already ▁migr ated ▁to ▁eastern ▁Texas . ▁ ▁El ▁Cu il ón ▁was ▁given ▁a ▁b aton ▁of ▁command ▁by ▁Martin ▁de ▁Al arc ón ▁in ▁ 1 7 1 9 , ▁indicating ▁that ▁at ▁least ▁the ▁Er v ip i ame ▁held ▁him ▁in ▁high ▁respect . ▁ ▁In ▁ 1 7 2 1 ▁El ▁Cu il ón ▁was ▁the ▁lead ▁negoti ator ▁for ▁the ▁Ran cher ia ▁Grande ▁tribes ▁with ▁the ▁Mar ques ▁de ▁Agu ay o . ▁ ▁In ▁ 1 7 2 2 ▁El ▁Cu il ón ▁was ▁the ▁leader ▁of ▁the ▁Er v ip i ame ▁and ▁associated ▁tribes ▁who ▁settled ▁at ▁Mission ▁San ▁Francisco ▁de ▁Naj era , ▁in ▁the ▁general ▁vic inity ▁of ▁modern ▁San ▁Antonio ,