Arabic numerals
The first mentions of the numerals in the West are found in the "Codex Vigilanus" of 976.
Johannes de Sacrobosco
Sacrobosco's "Algorismus" aka "De Arte Numerandi" is thought to have been his first work, and the date is estimated at about 1225, and before 1230. The Hindu–Arabic methods of numerical calculation had arrived in Latin Europe during the previous fifty years but had not been disseminated on a wide scale. Sacrobosco's "Algorismus" was the first text to introduce Hindu–Arabic numerals and procedures into the European university curriculum.