Acta Sanctorum
or MARTY- RUM, the collective title given to several old writings, respecting saints and martyrs in the Greek and Roman Catholic Churches, but now applied especially to one extensive collection begun by the Jesuits in the 17th century. Commenced by the Jesuit Rosweyd, continued by J. Bolland, the work was carried on after the latter's death by a society of learned Jesuits, who were styled Bollandists until 1794. In recent times, the undertaking has been resumed, until over 60 volumes have been published.