Ferizli is a municipality and district of Sakarya Province, Turkey. It takes its name from Feriz or Feyzi Aga who lived in the region. The name used as Firuzlu during the Ottoman period took its current form over time. It is recorded that it was founded as Feriz or Feyzi Aga Farm around 1400-1406, with the settlement of Armenians from Sivas who escaped from the tyranny of Timur. The farmland spread to the villages of Damlik in the east and Elmalik in the southwest. The town of Adapazari (Donigasen) was also founded by Armenian immigrants under the protection of the same bey.