Input: Article: After 539 Ravenna was reconquered by the Romans in the form of the Eastern Roman Empire (Byzantine Empire) and became the seat of the Exarchate of Ravenna. The greatest development of Christian mosaics unfolded in the second half of the 6th century. Outstanding examples of Byzantine mosaic art are the later phase mosaics in the Basilica of San Vitale and Basilica of Sant'Apollinare Nuovo. The mosaic depicting Emperor Saint Justinian I and Empress Theodora in the Basilica of San Vitale were executed shortly after the Byzantine conquest. The mosaics of the Basilica of Sant'Apollinare in Classe were made around 549. The anti-Arian theme is obvious in the apse mosaic of San Michele in Affricisco, executed in 545547 (largely destroyed; the remains in Berlin).

Now answer this question: Where are the remains of the apse mosaic of San Michele?

Output: Berlin

Input: Article: With the abatement of persecution, St. Jerome acknowledged the Empire as a bulwark against evil but insisted that "imperial honours" were contrary to Christian teaching. His was an authoritative but minority voice: most Christians showed no qualms in the veneration of even "pagan" emperors. The peace of the emperors was the peace of God; as far as the Church was concerned, internal dissent and doctrinal schism were a far greater problem. The solution came from a hitherto unlikely source: as pontifex maximus Constantine I favoured the "Catholic Church of the Christians" against the Donatists because:

Now answer this question: What pontifax maximus favored the Catholic church?

Output: Constantine I

Input: Article: The undergraduates have a number of traditions: Painting The Rock (originally a fountain donated by the Class of 1902) is a way to advertise, for example, campus organizations, events in Greek life, student groups, and university-wide events. Dance Marathon, a 30-hour philanthropic event, has raised more than 13 million dollars in its history for various children's charities. Primal Scream is held at 9 p.m. on the Sunday before finals week every quarter; students lean out of windows or gather in courtyards and scream. Armadillo Day, or, more popularly, Dillo Day, a day of music and food, is held on Northwestern's Lakefill every Spring on the weekend after Memorial Day. And in one of the University's newer traditions, every year during freshman orientation, known as Wildcat Welcome, freshmen and transfer students pass through Weber Arch to the loud huzzahs of upperclassmen and the music of the University Marching Band.

Now answer this question: When is Armadillo Day held every year?

Output:
on the weekend after Memorial Day