Libyan authorities trained Charles Taylor‘s rebel force in the 1980s before it violently overthrew Liberia’s government, the man who succeeded him as Liberia’s president testified Wednesday at Taylor’s war crimes trial.

Moses Blah briefly served as Liberian president in 2003, taking leadership of the war-ravaged country after Taylor was forced into exile. He is the 27th and highest-ranking witness to take the stand against Taylor since his trial began early this year.