San Patricio was founded around 1830 as the seat of the Power and Hewetson empresario colony, a Mexican land grant established to bring Irish Catholic immigrants to settle the lower Nueces River valley. The town functioned as the colony's civic and administrative center and as a modest farming and ranching settlement, where Irish colonists and their Mexican and Tejano neighbors raised livestock and worked the surrounding river-bottom and prairie land, giving the area a distinctly Irish-Mexican colonial character unusual among Texas settlements. That everyday agricultural community became a military flashpoint in late February 1836, when Mexican General Jose de Urrea's forces surprised and largely destroyed a Texian detachment under Colonel Frank W. Johnson quartered in the town, a defeat that helped clear the way for Urrea's advance toward Goliad. Today San Patricio remains a small, largely rural unincorporated community in San Patricio County, its population and built environment much diminished from its colonial-era role as a colony seat. The battle and the town's Irish colonial founding are commemorated through Texas historical markers in and around the town, which is recognized as part of the broader Irish-Texan heritage associated with the Power and Hewetson and McMullen-McGloin colonies. The site today functions primarily as a small heritage and marker-based commemorative destination rather than as an active center of trade or settlement.