Isfrid - actually baptised Laurentius Antonius - received his first music lessons from his father, who was the schoolmaster and organist in his birthplace Türkheim. After his stay as a pupil at the Jesuit grammar school in Munich, he entered the Praemonstratensian Imperial Abbey of Obermarchtal as a novice and also made his profession here. Following his increasingly well-known reputation as a composer, he was later appointed director musices of the abbey, but then also worked for 10 years as a parish priest in the surrounding village parishes. He then returned to the monastery as subprior. More and more frequently, various monasteries in the wide vicinity requested his musical theatre contributions, for which he was highly respected. Thus, one of these scenic cantatas was also performed during Marie-Antoinette's passing visit. He died in the monastery of Marchtal in 1771. Together with Kayser's works, all the other musical property of the monastery went to the Princely House of Thurn and Taxis after secularisation.
