Vassiliki Thanou | (

Greece’s top Supreme Court judge, Vassiliki Thanou, has been appointed caretaker prime minister ahead of early elections next month. President Prokopis Pavlopoulos named Ms. Thanou after efforts to form a coalition failed. Last week, Alex Tsipras resigned as prime minister to seek a new mandate for office.

Ms. Thanou, 65, becomes Greece’s first female prime minister. Elections are expected to be scheduled for 20 or 27 September.

Ms. Thanou’s appointment ends a week of fruitless negotiations as opposition party leaders tried unsuccessfully to form a government. Mr. Tsipras stepped down as prime minister and called early elections after 25 of his MPs quit Syriza over the bailout he agreed with European creditors and formed the left-wing Popular Unity party.