Mention may also be made of his editio princeps (1661) of the treatise of Hippolytus the Martyr on Antichrist, and of his notes on Phaedrus (with four new fables discovered by him) published in Pieter Burmann's edition (1698).
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In 1678 Gude, having quarrelled with the duke, retired into private life; but in 1682 he entered the service of Christian V of Denmark as counsellor of the Schleswig-Holstein chancellery, and remained in it almost to the time of his death.
Many of Ligorius' falsifications persist in the literature of the 17th and 18th century, e.g. the work of Marquard Gude and its later editions, but they were recognized by the mid 19th century.