Mathetes is not the name of a real person. The author is unknown and the name "Mathetes" was given by a translator which means "disciple." This document has been difficult to date and it has been dated by scholars anywhere from 130 A.D. to the third century.
God Himself, who is Almighty, the Creator of all things, and invisible, has sent from heaven, and placed among men, the Truth, and the Holy and Incomprehensible Word, and has firmly established Him in their hearts. He did not, as one might have imagined, send to men any servant, or angel, or ruler, or any one of those who bear sway over earthly things, or one of those to whom the government of things in the heavens has been entrusted, but the very Creator and Fashioner of all things--by whom He made the heavens--by whom he enclosed the sea within its proper bounds--whose ordinances all the stars faithfully observe--from whom the sun has received the measure of his daily course to be observed--whom the moon obeys, being commanded to shine in the night, and whom the stars also obey, following the moon in her course; by whom all things have been arranged, and placed within their proper limits, and to whom all are subject--the heavens and the things that are therein, the earth and the things that are therein, the sea and the things that are therein--fire, air, and the abyss--the things which are in the heights, the things which are in the depths, and the things which lie between. This He sent to them. Was it then, as one might conceive, for the purpose of exercising tyranny, or of inspiring fear and terror? By no means, but under the influence of clemency and meekness. As a king sends his son, who is also a king, so sent He Him; as God He sent Him; as to men He sent Him; as a Saviour He sent Him, and as seeking to persuade, not to compel us; for violence has no place in the character of God. (VII).
For God, the Lord and Fashioner of all things, who made all things, and assigned them their several positions, proved Himself not merely a friend of mankind, but also long-suffering. Yea, He was always of such a character, and still is, and will ever be, kind and good, and free from wrath, and true, and the only one who is [absolutely] good; and He formed in His mind a great and unspeakable conception, which He communicated to His Son alone. As long, then, as He held and preserved His own wise counsel in concealment, He appeared to neglect us, and to have no care over us. But after He revealed and laid open, through His beloved Son, the things which had been prepared from the beginning, He conferred every blessing all at once upon us, so that we should both share in His benefits, and see and be active. Who of us would ever have expected these things? He was aware, then, of all things in His own mind, along with His Son, according to the relation subsisting between them. (VIII).
If you also desire this faith, you likewise shall receive first of all the knowledge of the Father. For God has loved mankind, on whose account He made the world, to whom He rendered subject all the things that are in it, to whom He gave reason and understanding, to whom alone He imparted the privilege of looking upwards to Himself, whom He formed after His own image, to whom He sent His only-begotten Son, to whom He has promised a kingdom in heaven, and will give it to those who have loved Him. (X).
[The Father] sent the Word that he might be manifested to the world . . . This is he who was from the beginning, who appeared as if new, and was found old . . . This is he who, being from everlasting, is today called the Son. (XI).