Keywords: Laon 444 299v.png en MS Laon Bibl mun 444 fol 299v Explanation of the nine muses hand of Martinus Hibernensis Martin of Laon reproduced from John J Contreni The Cathedral School of Laon from 850 to 930 Its Manuscripts and Masters Munich Arbedo Gesellschaft 1978 Table III MS Laon Bibl mun 444 fol 299v Martinus Hibernenis autograph century 9 PD-old-100 9th-century manuscripts |