I’ve always thought that the next-door Dome of the Rock was a Byzantine church before it was turned into a mosque.
It has the shape of a Byzantine church and is not like any other mosque in the world.
If it was a church, then it also might have mosaics, some of which might depict Jerusalem as it was in the 4th century.
And, more light might be shed on 4th century Byzantine art if these were to be rediscovered.
But I doubt the mosque guardians would ever permit anyone to challenge their assertion that a caliph built the mosque; or that anyone was ever there before muslims...
The site of al-aqsa was originally a small prayer house built by caliph Umar, who was born in 581, when mohammed was 11.
When mohammed in his drug-induced stupor dreamed that he was taken to heaven (and returned) in a single night, no mosque yet existed in Jerusalem!
Pretty good trick!
I saw a film where some local monks said just that. It was well known that the Dome of the Rock mosque was made out of pieces of Christian churches.
If there were any mosaics depicting life in the 4th century, I doubt they survived. Muslims don’t allow images.