Lars Gathenhielm was born on the Gatan estate in
Onsala Parish in
Halland. His parents were the sea captain Anders Börjesson Gathe and his wife Kerstin Larsdtr Styrman, daughter of a mill owner in Hjälm, Fjärås Parish. Before his knighthood in 1715, he was known as
Lars Andersson Gathe or
Lasse i Gatan.{{cite web|url= https://historiesajten.se/visainfo.asp?id=579|title = Lars Gathenhielm To protect Swedish shipping from pirates and to harm the enemy, in June 1710 the government of King
Charles XII of Sweden gave Lars Gathe
Letter of marque granting permission to seize ships from enemy nations including Denmark and Russia. His vessels captured foreign merchant vessels and forced them into port where both cargo and ships were sold. The spoils were also sold at
Dunkerque in northern France. He had a great deal of early success with his galleon
Lilla Jägaren, and as the volume of hijackings increased, many local sailors were quickly recruited to work the privateer ships. He suffered from a hip injury that made him dependent on crutches and may not have spent much time at sea himself, instead directing the work from
Gothenburg.{{cite web|url= http://www.ericsonwolke.se/las_mer_lasse_i_gatan.htm|archive-url= https://web.archive.org/web/20100812142016/http://www.ericsonwolke.se/las_mer_lasse_i_gatan.htm|url-status= dead|archive-date= August 12, 2010|title = Lasse i Gatan, Kaparkriget och det svenska stormaktsväldets fall|website= ericsonwolke.se Gathenhielm was accused of piracy against Swedish ships as well, but was protected by the king himself and therefore never punished. He and his brother Christen (1682-1722) were
ennobled in 1715 under the surname Gathenhielm for their efforts on behalf of Swedish navigation. Gathenhielm was later also appointed
commodore in the
Royal Swedish Navy. Lars Gathenhielm died from
tuberculosis at his house at Lilla Torget in Gothenburg in 1718 at the age of 29. His wife
Ingela Gathenhielm née Hammar (1692–1729), who he had married in 1711, succeeded him and expanded the various business enterprises. Following their deaths, they were both buried in the Gathenhielm family tomb at Onsala Church.{{cite web|url= https://sok.riksarkivet.se/sbl/Presentation.aspx?id=14669|title = Christen Gathenhielm ==References==