According to Pope Francis, from the very beginning of the life of the Church, Christians have always believed that the blood of martyrs is a seed for Christians as Tertullian said.

Grieving at the loss of thy young spouse, thou didst renounce the world, O Martyr Constantine, but seeing thy humility God called thee to leave thy solitude and serve Him as a priest. Following thy example, we pray for grace to see that we must serve God as He wills and not as we desire, that we may be found worthy of His great mercy - Troparion of St Constantine Tone 5.