Kauku IV Karjalainen

Kauku IV Karjalainen was the seventh Grand Duke of the Grand Duchy of Karelia, whose reign, which began in 639, saw great reforms to the titles of the nobility, dividing the power of Karelia's nobles into the regions of the North, South, and the Isthmus. His administrative skill and military shrewdness made him well-loved during his time, but he never married, and thus never produced a direct heir, causing a succession crisis upon his death, which concluded with the end of the Kaukid dynasty and the rise of his brother-in-law, Dravenis I Siensalainen, to the throne.