Today's Stational Church is at the Church of St. Cyriacus. Dom Gueranger writes, "The Station in Rome was formerly the church of the martyr St. Cyriacus, and as such it is still given in the Roman missal; but this holy sanctuary having been destroyed, and the relics of the holy deacon translated to the church of St. Mary in Via lata, it is here that the Station is now held."
For information on this devotion, see the Stational Churches of Lent Homepage. I will post on each Stational Church for Lent. Information is from the Canon Regulars of St. John Cantius:
The Sacred Texts, which like a garland, surround the celebration of the Eucharistic Sacrifice and the Divine Office must not only be understood in their literal and historical sense, but above all in their liturgical one. This is always the case, but especially during Passiontide.
The Divine Head, who nineteen centuries ago underwent the great Passion is now undergoing it in His Body, the Church. An attack on the Church is an attack on Christ. Whenever the Church suffers, her Divine head suffers. But all these sufferings lead to victory. "They have persecuted Me, they will also persecute you. The disciple is not greater than the Master." Persecutions and sufferings purify the Church. They remove what is not of God. They cast forth all that comes from Satan—the arch-enemy, and that comes from the fatal act in Paradise—the arch-sin.
May the holy Deacon Cyriacus obtain for us "God's light and truth and conduct us and bring us to His holy hill, to the altar, to Calvary, to Easter, to the immortal Christ at the right-hand of the Father.
Let us pray: O Lord, deliver me from the unjust and deceitful man. Send forth Thy Light and Thy Truth. They shall lead me on. Through Christ, Our Lord.
Amen.