Boierus Laurentius (about 1561–1619) was a poet of Swedish descent, who graduated from the University of Vilnius. His main work is "Carolomachia" – a poem dedicated to the victory of Lithuanians over Sweden army in the Battle of Kircholm in 1605. The poem was written and published in 1606 - just after one year of the event. The poem celebrated Grand Hetman ("polemarchos" as referred in the poem) of Lithuania Jan Karol Chodkiewicz and the Lithuanian army. Many interesting battle details were attested in his poem, also one of the first mentionings of the Lithuanian battle cry - "muški!" (', ')