There is sufficient proof that Matthew of Janov was a very voluminous writer, but his works have reached us in a very incomplete state, and they were entirely unknown before the present century. It is not difficult to account for the almost complete oblivion into which these important works had fallen. Though the teaching of Matthew was on many points similar to that of the Hussites, yet no reverence for his person and his memory was felt by them. They could not refrain from contrasting his recantation with the very different behaviour of Hus under similar circumstances. If some of his works have been preserved through the agency of the party that favoured Church reform, this was because such writings were attributed to Wycliffe or Hus. The adherents of the Church of Rome were, of course, anxious that, after his recantation, the former heretic theories of Matthew should, as far as possible, be buried in oblivion. They, not without reason, regarded some of the opinions of Matthew as most dangerous for their Church. The celebrated Protestant divine Neander, who perhaps has studied the works of Janov with more care than any one else, declares that a thorough study of Janov's works proves that, independently of Wycliffe, there existed in Bohemia at the end of the fourteenth century a strong reaction against the Roman hierarchy, founded on principles somewhat similar to those of the later German reformers. In his _Kirchengeschichte_, also, Neander has expressed the opinion that the views of Hus not only did not go farther than those of Matthew of Janov, but that they indeed remained somewhat behind those of the earlier divine. It is certain that some of Janov's writings were in Bohemian, as a decree of the archiepiscopal vicariat (dating from the year 1392) has been preserved in which Matthew was ordered to submit for inspection two Bohemian books which he had just written. All trace of both these books has long been lost. There is, however, no doubt that the majority of Janov's books were written in Latin. Those that have been preserved consist of a large number of religious pamphlets, written at different periods. Towards the end of his life Matthew collected these writings and published them in a large book entitled _Regulæ Veteris et Novi Testamenti_. The work is divided into three books consisting of chapters, some of which retain the designation under which they had formerly appeared as separate pamphlets. No complete MS. of the _Regulæ Veteris et Novi Testamenti_ is in existence, but it would be quite possible to reconstruct the work from the different MSS. and publish it; there seems, however, to be at present little probability that any one will undertake this task.