Heroes of Might and Magic II: The Succession Wars

Lord Ironfist has successfully unified the continent of Enroth and secured his rule as king. Upon the king's death, his two sons, Archibald and Roland, vie for the crown. Archibald orchestrates a series of events that lead to Roland's exile. Archibald is then declared the new king, while Roland organizes a resistance. The game is the second installment of the Heroes of Might and Magic series and is typically credited as the breakout game for the series. (wikipedia.org)