The 9th century
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.
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.
King Alfred Was the Wessex King During the Battle of the Wessex People and the Danes
King Alfred, also known as Alfred the Great, was born at the Royal Palace in Wantage, United Kingdom in 849 AD. He reigned as the King of Wessex for 28 years.
King Alfred of Wessex is credited with the unification of England.
"Alfred the Great" was the King of Wessex from 871 to 899.
Wessex
Alfred the Great had four brothers: King Æthelbald of Wessex, King Æthelberht of Wessex, King Æthelred of Wessex, and Æthelwulf. Æthelwulf was the father of Alfred the Great. These brothers played significant roles in the history of the Anglo-Saxon kingdoms during the 9th century.
Alfred
King Alfred of Wessex had several brothers, the most notable of whom were Æthelred I and Æthelhelm. Æthelred I served as King of Wessex before Alfred and Æthelhelm was a prominent nobleman. Alfred's family played a significant role in the leadership and defense of their kingdom during the Viking invasions.
August 8th, 1509
King Alfred the Great ruled Wessex from 871-884,it was in 884 that he laid claim to being king of the English.