Late 16th century; earliest use found in Robert Barrett (fl.?1586–1607), soldier and author. From Spanish abanderado standard-bearer from a- + bandera + -ado.
Definition of abanderado in US English:
abanderado
nounəˌbandəˈrɑːdəʊ
rare
A standard-bearer.
Origin
Late 16th century; earliest use found in Robert Barrett (fl. ?1586–1607), soldier and author. From Spanish abanderado standard-bearer from a- + bandera + -ado.