How does the Virgin Mary fit into all this?
Evan's theory:

WSJ 5/13/10---Pope Benedict XVI traveled to the Catholic shrine of Fatima to mark the date the Virgin first appeared there--May 13, 1917, and the assassination attempt on Pope John Paul II on May 13, 1981. John Paul believed the Virgin's "unseen hand" had "rescued him from death in the assassination attempt". John Paul gave the bullet that was extracted from his abdomen to the Fatima shine, it is now mounted as part of the Virgin's gold crown on her statue at Fatima.
Evan notes this is a strong endorsement of Her protection capabilities.

I recently discovered that Athena's birthday (Panathenaia) and the
Assumption of the Virgin Mary are the same day--August 15th.
The great festival was performed every four years from 570 BCE onward, though there were yearly "small" Panathenaias as well. The date was the twenty-eighth day of the month Hekatombaion (mid-July to mid-August). See
For hundreds of years, Catholics observed the feast of the Assumption of the Blessed Virgin Mary on August 15..See

As Mary became Queen of Heaven, She assumed some of Athena's roles--

Biblical passages as in Revelation XII: 1-2, where the pregnant Divine Mother Sophia appears in heaven “robed with the sun, beneath her feet the moon, and on her head a crown of twelve stars”.
Rev. XII: 5 goes on to say: “She gave birth to a male child”

Mary as appears on the Miraculous Medal

"...insamuch as God, by one and the same decree, had established the origin of Mary and the Incarnation of Divine Wisdom."
Pope Pius IX- Bull Ineffabilis- 1854

The Divine Wisdom was incarnate in the Virgin Mary.
Athena was the Goddess of Wisdom.

Due to the intercession of the Theotokos (Virgin Mary), the city is saved. "While the Emperor of Byzantium Heracleios was on an expedition to fight the aggression of the Persians on their own grounds, there appeared outside the walls of Constantinople barbaric hordes, mostly Avars. The siege lasted a few months, and it was apparent that the outnumbered troops of the Queen City were reaching desperation. However as history records, the faith of the people worked the impossible. The Venerable Patriarch Sergius with the Clergy and the Official of Byzantium Vonos, endlessly marched along the great walls of Constantinople with an Icon of the Theotokos in hand, and bolstered the faith of the defenders of freedom. The miracle came soon after. Unexpectedly, as the chronicler narrates, a great storm with huge tidal waves destroyed most of the fleet of the enemy, and full retreat ensued.

The faithful of Constantinople spontaneously filled the Church of the Theotokos at Vlachernae on the Golden Horn, and
with the Patriarch Sergius officiating, they prayed all night singing praises to the Virgin Mary without sitting. Hence the title of the
Hymn "Akathistos", in Greek meaning 'not seated'.

The Akathist Hymn to the Theotokos-

Unto you, O Theotokos, invincible Champion, your City, in thanksgiving ascribes the victory for the deliverance
from sufferings. And having your might unassailable, free us from all dangers, so that we may cry unto you:

Rejoice, O Bride Ever-Virgin.

Rejoice, Vessel of the Wisdom of God. Rejoice, Treasury of His providence. "

Here is Theotokos performing in Athena fashion to protect Constantinople. In the Akathist Hymn, Theotokos (Virgin Mary) is described as an "invincible Champion" with "might unassailable" who saves the city. She is the "Vessel of the Wisdom of God". The Virgin Mary is assuming Athena's role in protecting the city.
(See footnote 1)

"The most important symbol of Greek heathenism, the Parthenon, was changed in the seventh century into a church for Aghia Sophia, the divine wisdom..."
(see footnote 2)
This shows beyond any doubt that the Christian Church linked Divine Wisdom to Athena.
"It is by no means coincidence that the chief temples of Pagan Athens and Christian Constantinople were both dedicated to Wisdom. The Parthenon as the shrine of the Goddess Athena, Goddess of Wisdom, and Justinian's Great Church both showed respect for "Sophia" which has always been one of the chief traits of the Greek mind."
(see footnote 3)

Footnote 1 (Divine Sevices & Hymns---Akathist Hymn)
Footnote 2 (para 2)
Footnote 3 (see "The Church of St. Sophia")