Did Saint Augustine use the Julian calendar?
Rationale first then the answer.
The Julian calendar was in use from 45 BC to the late 16th century AD. Saint Augustine lived from 354 AD to 430 AD.. The answer is: yes.

Does Iphone have more iterations than Samsung Galaxy?
Rationale first then the answer.
As of 2020 the latest Iphone is Iphone 11. As of 2020 the latest Samsung Galaxy phone is the Samsung Galaxy S20.. The answer is: no.

Was 1941 Operation Barbarossa related to The Crusades?
Rationale first then the answer.

Operation Barbarossa referred to the 1941 German invasion of the Soviet Union. Frederick Barbarosa was the Holy Roman Empire that drowned while marching his army to The Crusades. The Holy Roman Empire was a medieval empire that ruled over lands including what became modern Germany.. The answer is: yes.