July 31, 1826 - Juhani Aataminpoika
Known by the alias Kerpeikkari, this Finnish killer carried out a concentrated wave of violence across southern Finland in the span of just two months, claiming twelve lives. The brevity and intensity of the killing period set him apart in Finnish criminal history, making him one of the most significant cases of serial murder recorded in the country during the nineteenth century.
From Wikipedia
Juhani Aataminpoika (Finnish pronunciation: [ˈjuhɑni ˈɑːtɑminˌpoi̯kɑ]; born 31 July 1826 – September 1854) alias Kerpeikkari (Finnish: [ˈkerpei̯kːɑri]), was a Finnish serial killer. He killed 12 people in southern Finland between October and November of 1849. He has been characterized as the first serial killer in Finland.
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