Greece's parliament on Wednesday elected the first woman president in the country's history, a senior judge with an expertise in environmental and constitutional law.

A cross-party majority of 261 MPs voted in favor of 63-year-old Ekaterini Sakellaropoulou, parliament chief Costas Tassoulas said.

"Ekaterini Sakellaropoulou has been elected president of the republic," Tassoulas said.

The new president, until now the head of Greece's top administrative court, the Council of State, will take her oath of office on March 13, he added.

The daughter of a Supreme Court judge, Sakellaropoulou completed postgraduate studies at Paris's Sorbonne university.

She was also the first woman to head the Council of State.

Although the president is nominally the head of the Greek state and commander-in-chief, the post is largely ceremonial.

Greek presidents confirm governments and laws and technically have the power to declare war, but only in conjunction with the government.