ATHENS (Reuters) – Greece’s former King Constantine II, whose nine-year reign coincided with one of the most turbulent periods in the country’s political history, died on Tuesday aged 82, state website ERT news reported. Constantine II, the only son of King Paul and Queen Frederica of Greece, ascended to the throne in 1964 after his father died but his reign was marred by political instability which culminated in a military coup on April 21, 1967. A few months later, he was forced to flee the country after leading an unsuccessful countercoup against the then military junta. He remained in Rome…