CAIRO — Egyptian authorities confirmed Saturday that a political coalition dominated by the Muslim Brotherhood, the 84-year-old group that virtually invented political Islam, had won about 47 percent of the seats in the first Parliament elected since the ouster of Hosni Mubarak. An alliance of ultraconservative Islamists won the next largest share of seats, about 25 percent.

The military council leading Egypt since Mr. Mubarak lost power last February has said it will keep Parliament in a subordinate role with little real power until the ratification of a constitution and the election of a president, both scheduled for completion by the end of June.