 Bartholomew's chief title to fame rests upon his remarkable book, "De Conformitate Vitae B. P. Francisco ad Vitam Domini Nostri Jesu Christi", begun in 1385 and formally approved by the general chapter held at Assisi in 1399.Enthusiastically received on its appearance and long held in high esteem, this work became the object of bitter attacks on the part of Lutherans and Jansenists.Against it Erasmus Alber wrote the "Alcoranus Franciscanus" (Der Barfusser Monche Eulenspiegel und Alcoran mit einer Vorrede D. M. Luthers, 1531) in reply to which Henry Sedulius, OFM, published his "Apologeticus adversus Alcoranum Franciscanorum pro libro Conformitatum" (Antwerp, 1607).