What is "vallahades"

The Vallahades or Valaades (Βαλαάδες) were a Greek-speaking, Muslim population who lived along the River Haliacmon in southwest Greek Macedonia, in and around Anaselitsa (modern Neapoli) and Grevena. They numbered about 17,000 in the early 20th century. They are a frequently referred-to community of late- Ottoman Empire converts to Islam, because unlike most other such communities of Greek Muslims in Ottoman Macedonia the Vallahades retained many aspects of their Greek culture and continued to speak Greek for both private and public purposes. Most other Greek converts to Islam from Ottoman Macedonia, Thrace, and Epirus generally adopted the Turkish language and culture and thereby assimilated into mainstream Ottoman society.