Which Maya codex was formerly known as the Grolier Codex?

The codex formerly known as the Grolier Codex is the Maya Codex of Mexico.

It received the name Grolier Codex after being displayed at New York’s Grolier Club in 1971. It was also called the Sáenz Codex after Mexican collector Josué Sáenz, who acquired it in the 1960s and later donated it to Mexico. In 2018, Mexico’s National Institute of Anthropology and History officially adopted the name Maya Codex of Mexico.

The manuscript is a screenfold book made from amate, or fig-bark paper. It originally contained about 20 pages, but only a fragment survives. Its pages show figures associated with dates and Venus-related material, making it an important source for studying Maya astronomy and calendrical practice.

Its authenticity was debated for decades because of its uncertain excavation history and its late appearance in modern collections. Scientific and art-historical investigations supported its pre-Columbian origin, and it has been dated to approximately 1021–1154 CE. It is one of only four surviving Maya codices, alongside the Dresden, Madrid, and Paris codices.