Hacı Ahmed Hilmi Efendi, born 1852 in Kızılcahamam, Ankara, was a late-Ottoman scholar who received Naqshbandi-Khalidi succession from Ahmed Ziyâüddîn Gümüşhânevî. He served as imam and professor at the Fevziye and Yeni Cuma mosques in İzmit and died there in 1916, buried in the Bağçeşme Martyrs' Cemetery. (Sources: Evliyalar.net; Akra Media.)