Roman Catholic Mariology
The earliest recorded prayer to Mary, the sub tuum praesidium, is dated in its earliest form to around the year 250.
In Egypt the veneration of Mary had started in the 3rd century and the term Theotokos was used by Church Father Origen.
In the 5th century, the Third Ecumenical Council in Ephesus declared Mary as Theotokos (God-bearer).[54] Churches dedicated to Mary were constructed across the Christian world, among the most famous being Santa Maria Maggiore in Rome.
After the 5th century, the celebration of the Assumption of Mary began to spread across the Christian world.
The Middle Ages saw growth and development for Mariology and prayers to Mary such as the Ave Maria, and chants such as Ave Maris Stella and the Salve Regina emerged and became staples of monastic plainsong.
https://en.wikipedia.org/wiki/Roman_Catholic_Mariology