Final answer:
The Duke summons Othello to address the urgent issue of the Turkish fleet threatening Venice's interests in Cyprus and to strategize for its defense.
Step-by-step explanation:
In Act I, scene ii of Shakespeare's play "Othello", the Duke summons Othello to address the urgent matter of the Turkish fleet advancing towards Cyprus, which is a Venetian territory.
Duke and the senators urgently need Othello, renowned for his military expertise and leadership, to strategize and lead the defense against this imminent threat. This scene highlights the importance of Othello's role in Venice despite the racial prejudices he faces as a Moor.