The Stone of Motecuhzoma I is a pre-Columbian stone monolith dating back to the rule of Motecuhzoma I (1440-1469), the fifth Tlatoani (ruler) of Tenochtitlan. The monolith measures approximately 12 feet in diameter and 39 inches tall, and is also known as the Stone of Motecuhzoma Ilhuicamina, the Cuauhxicalli of Motecuhzoma Ilhuicamina, the Archbishop's Stone, the Ex-Arzobispado Stone, and the Sánchez-Nava Monolith. Historical sources refer to it simply as "temalacatl," literally meaning "round stone."