Fethullah Gülen, who died in a US hospital on Sunday, was an Islamic preacher who was central to helping Recep Tayyip Erdoğan build and cement his power over Turkey but ended up becoming his most hated foe.
The 83-year-old cleric, who spent the past 25 years holed up in a Pennsylvania mountain retreat, built a network of millions of supporters and sympathisers that, at its peak, had enormous influence within the state.
The movement wielded its power to help Erdoğan in his battle against…
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