Treaty signed in 1430 AD between Kara Sinan Pasha and 14 villages in Zagoria which sought independence, self-government and exemption from payment of taxes.
The Kara Sinan Pasha had considered the spontaneous capitulation of the 14 villages very crucial for the surrender of the Castle of Ioannina and for this reason he granted autonomy and self-government to  these villages and instead of paying taxes the villages had to send every year in Istanbul a number of men,  proportionally with  the population of each village, for a period of  50 days in order to serve as horses grooms in the stables of the Sultan (Voinak = horses groom and  voinikides = conscripts).
Many voinikides when their mandate settling in Istanbul ended,  they invited there their relatives who  later quickly spread to Wallachia, Russia, Asia Minor, Serbia, Austria, Bessarabia and elsewhere. There they thrive and create a large property.
This institution lasted until 1670 when the villages of  Zagoria   managed  to pay only taxes instead of giving military service men to Pasha .
In the beginning Koukouli had to send 7 men for that purpose and later  had to pay  a certain monetary amount.