ENPublication of the summary book is intended to provide the researchers of history of the Grand Duchy of Lithuania with regesta of documents, originals of which are, to a large extent, unknown today. Very few of them were preserved in their original form, and not many more as entries in Lithuanian Metrica. The summary book includes those files, which after the death of Krzysztof ‘Piorun’ Radziwiłł, Voivode of Vilnius and Great Hetman of Lithuania, were not divided between his sons - Janusz and Krzysztof. Some of those documents pertained to Radziwiłł family members (appointments to offices, royal endowments, property documents), some are public documents. Some of the regesta deserving attention include those related to history of Volhynia (1395–1443) and documents of King Sigismund August. The summary book was preserved in form of an entry in a later, dated 1616, general summary book of the archive of Krzysztof Radziwiłł, Field Hetman of Lithuania at the time. Keywords: family archive, public documents, Radziwiłł family, Grand Duchy of Lithuania, Volhynia.