Diamandi or Iamandì Djuvara, also known as Giuvara, Juvara or Tzouvara, was an Ottoman–Wallachian mercenary and boyar, with the rank of Serdar. Greek-speaking, he originated from the ethnically diverse Sanjak of Ioannina, and had various Balkan identities ascribed to him; some historians conclude that he was an Aromanian, like other carriers of the name "Djuvara", with whom he was likely related. He arrived to Wallachia during the final stages of Phanariote rule over that country. By the 1810s, as a military expert, he was serving Prince John Caradja in dealing with the emergence of anti-state brigandage in Oltenia. Djuvara never managed to capture in combat the celebrated hajduk Iancu Jianu, but used deceitful tactics in apprehending two of Jianu's allies, Nikola Abraš and Receb Ağa. He honored a peace agreement with Jianu, but was unable to prevent Jianu's imprisonment by Caradja.