I wonder if you mean Alfred the Great, because Alexander the Great was Greek, born around 372 BC.
Alfred the Great became King in 871 AD.
Yes
Alexander the Great succeeded the throne of his father Philip of Macedon in 336 BC ; see relevant link .
Alexander the Great took up the throne of the Greek kingdom of Macedonia because he was King Philip's II son.
His son Alexander IV
he was about 12 years old
Yes
No, Alfred the Great did not usurp the throne. He inherited the throne of Wessex after his older brother died and proved himself to be a capable and revered king, known for his military successes and cultural achievements.
Alexander the Great succeeded the throne of his father Philip of Macedon in 336 BC ; see relevant link .
Alexander the Great took up the throne of the Greek kingdom of Macedonia because he was King Philip's II son.
His son Alexander IV
32
Yes Alexander the Great was a king. After his father (Philip II of Macedon) was assassinated in 336BC, the throne went to Alexander.
The age of 20.
he was about 12 years old
Phillip II as in the father of Alexander the Great came to the Macedonian throne in 359 B.C.
Alexander the Great invaded the Achaemenid empire while Darius III was on the throne. He was the nephew of Artaxerxes IV Arses, placed on the throne after Bagoas killed Arses and all of his children.
When he came to throne at the age of twenty