Alchas of Toul was a 5th-century Catholic priest who served as the third bishop of Toul. Active around the year 420, he occupied the episcopal seat following Saint Amon and preceding Saint Gelsimus. Very little is known about his personal life, as historical records regarding his tenure are limited to specific ancient documents.
Historical record
Information regarding his life survives primarily through two sources. His name appears in the manuscripts written by Adso and is also recorded within the epitaphs of the bishops of Toul. These documents place him in the succession of leaders for the diocese during the early 5th century.
Veneration
He is recognized as a saint within the Roman Catholic Church. His legacy is preserved through the ecclesiastical history of the region and the liturgical traditions that honor the succession of the bishops of Toul.