Lesya Ukrainka
Olha Petrivna Kosach (29 June 1849 – 4 October 1930), better known by her pen name Olena Pchilka (), was a Ukrainian publisher, writer, ethnographer, interpreter, and civil activist. She was the sister of Mykhailo Drahomanov and the mother of Lesya Ukrainka, Olga Kosach-Kryvyniuk, Mykhajlo Kosach, Oxana Kosach-Shymanovska, Mykola Kosach, Izydora Kosach-Borysova and Yurij Kosach.