Jan Łasicki (Latin: Johannis Lasitii or Lasicius; 1534–1602)[1] was a Polish historian and theologian.
[2] His major work is eight-volume Historia de origine et rebus gestis fratrum Bohemicorum.
The Only one volume survives which deals with customs and organizations of the brethren and was first published in 1660.
His other works include Historia de ingressu Polonorum in Valachiam cum Bogdano (1584) about the Polish invasion of Wallachia.
His 18-page Concerning the gods of Samagitians, and other Sarmatians and false Christians (De diis Samagitarum caeterorumque Sarmatarum et falsorum Christianorum, written c. 1582 and published in 1615) provides a list of Lithuanian gods and is an important resource in the study of the Lithuanian mythology.