Constanza is the Spanish-Italian form of Constance. **Constanza Manuel of Castile (1316-1345)** was the Castilian princess and **Queen of Portugal** through her marriage to King Pedro I — her death cleared the way for Pedro's love affair with Inês de Castro. Multiple medieval Iberian queens.
Used widely across Spain and Italy.
Constanza reduces to eight — the number of Iberian queen.