LONDON (AP) — WikiLeaks founder Julian Assange faces a key hearing Monday in his decade-and-a-half-long attempt to avoid extradition to the United States on espionage charges.

Assange, 52, faces charges related to his organization’s publication of a huge trove of classified documents. He has been in custody in a high-security London prison since 2019, and previously spent seven years in self-exile in the Ecuadorian Embassy in London.

Two judges at London’s High Court will hold a hearing Monday on whether Assange will be allowed to appeal against his extradition order. If he loses he will have exhausted all his legal routes in the U.K.

Here is a look at key events in the long-running legal saga:

— 2006: Assange founds WikiLeaks in Australia. The group begins publishing sensitive or classified documents.

— 2010: In a series of posts, WikiLeaks releases almost half a million documents relating to the U.S. wars in Iraq and Afghanistan.