The oldest known bishop of Moglenon was Saint Hilarion, who founded a monastery dedicated to the Holy Apostles, to tackle sects in the 12th century. (probably near the Promachon). The monastery, however, was destroyed during the Turkish occupation as we learn from the locals. As noted, Saint Hilarion was the biggest opponent of the sect of Bogomils. It is said that there lived many monks, under the indoctrination and teaching of Saint. With the destruction of the monastery by the Turks, the name of St. Hilarion was forgotten and revived after the liberation of Macedonia.
The homonymous monastery today to Promachon, is in modern construction. It was recently restored, and the church was inaugurated in 2012. Today it is a nunnery, and hosts three nuns.
It is important to mention that during the construction of the church identified findings which suggest that in the same position there was a Paleochristian building which was probably built on a previous pagan temple, (probably the temple of Artemis Agrotera).
 Eugenidou, D., “Excavations in Byzantine, Central and West Macedonia, Servia and Moglena”, The archaeological work in Macedonia and Thrace 1, 1987, pp. 63-68.
 Martakis, A. M., Monastery of Archangel Michael in Almopia of the prefecture of Pella, Monastery of Archangel Michael Almopia, 2006, p. 18. The Bogomils were named by the Bulgarian Bogomils priest who lived in the mid-10th century in Bulgaria. The Vogomilismos was deeply influenced by the heretical stream of Paflikianismos and as it had won some support among rural populations. The Bogomils hostile the ecclesiastical hierarchy, as the work which was dedicated to Christ and inviting the poor to resist against the government and the rich. They were a real "headache" for the government of the time and came into armed conflict with the government although theoretically reject violence. See. Charalampakis, P., '' Paflikianismos and Vogomilismos: religious sects and popular movements '', E-Historically, December 2011, p. 49-84.
 Bishop of Edessa, Pella and Almopia Joel, Saint Hilarion, Saint Hilarion Monastery Promachon, 2015.
 Chrysostomou, A., AD 45, 1990, p. 372 · idem, AD 56-59, B2 Chronicles, 2001-2004, p. 477.
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Both the old monastery and the courtyard of it, are in very good condition. In the buildings and in the open space of the monastery, dominate the stone and wood. The monastery opens its doors every day 09: 00-13: 00 and 16: 00-18: 00 in winter, and 09: 00-13: 00 and 17: 00-20: 00 in summer. According to the nuns, the monastery has many visitors and receives much support from the locals. Its relationship with the society of Promachon looks good and the eve of the festival of St. Hilarion, on October 21, the monastery was filled with people who carry baskets and offertories, in honor of the miracle of the five offertories (particularly on the eve of the festival). The monastery is also celebrating the Apostles Peter and Paul, on 29 June.