Theories claim that when Emperor Honorius left the palace when he saw that the barbarians were approaching and that he paid the barbarians to attack his kingdom. Procopius believed more in the theory that he abandoned the castle and fled.
We can arrive at this answer because:
Procopius claims that barbarian attacks were not a great concern for Emperor Honorius.
That's because he believed his realm was too far away from where the attacks were taking place.
However, when the barbarians began to approach, he began to fear a possible attack.
There is a theory that when the barbarians got too close, he fled far away. Procopius believes that this theory is the truest and closest to reality.
Another theory claims that he paid the barbarians to attack his kingdom, as this attack would fight rebellions from his subjects.
Procopius does not believe in this latest theory and there is not even evidence that it could be real.
I would say Isaac Newton because his branch was basically physics. He was concerned with matter and motion. Also measuring mass of the sun and planets.