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San Xavier Mission Complex is an archaeological site that includes the San Xavier de Horcasitas, the San Ildefonso and the Candelaria Missions.

The church is architecturally significant as physical evidence of building practices and techniques used during the Spanish colonial period. It is the least altered of all the Texas mission churches and has the only original dome of those in San Antonio.

Oldest mission site yet discovered in Spanish Texas, the oldest European site yet discovered in East Texas and the oldest site yet discovered known to bear the name Tejas.