The most mysterious heraldic symbol of Lithuania is a spearhead with a cross, found on the early Lithuanian coins (also known as "PEČAT" or "" coins) that were minted by Jogaila, Vytautas the Great, and possibly Algirdas or Skirgaila. The mystery comes from the fact that it was used by both Jogaila and Vytautas, who fought the Lithuanian Civil War (1381–1384), therefore it is impossible that Jogaila used his rival's symbol, however it is also not a dynastic symbol like the Columns of Gediminas. A particularly important argument for determining the time of minting the "PEČAT"-type coins is the treasure discovered in Borshchiv (near Kyiv) in which a "PEČAT"-type coin was found along with the hryvnia of the Novgorod Republic, coins of the Grand Prince of Kyiv Vladimir Olgerdovich, and dirhams of the Golden Horde's Khans (the latest coins of them are of Khan Tokhtamysh, minted in the early 1380s). Vladimir Olgerdovich, son and vassal "knyaz" of Algirdas, minted coins at the Principality of Kiev since the 1360s, therefore it is highly unlikely that his father Algirdas did not mint his own coins at the late period of his reign. Furthermore, the Lithuanians were skilled at fighting using spears, especially on horseback, and the earliest written mention of such tactics dates to 1208 when Lithuanians, riding on horses, threw spears into their enemies.