Which UNESCO World Heritage monastery in La Rioja is considered the birthplace of the written Spanish language, where the first known written words in Spanish were recorded?

• A Santo Domingo de Silos
• B Santa Maria de Montserrat
• C Poblet Monastery
• D San Millan de la Cogolla ✓

The Glosas Emilianenses, marginal annotations written at San Millan de la Cogolla in the 11th century, contain the earliest known written examples of both Spanish and Basque.