Quartigod 5th king of the Ur III dynasty (~2037-2029 BCE). Son of Šulgi. Built the Muriq-Tidnim ("Repeller-of-the-Tidnim") defensive wall — a 280-km earthwork between the Tigris and the Euphrates north of Sippar to repel the Amorite incursions; the canonical-primary archaeological-attested precursor to the later defensive-wall tradition (Median Wall, Sasanian Gorgan Wall, Great Wall of China). The wall failed: Amorite migration through gaps continued and contributed to the Ur III collapse under Ibbi-Sin. Subject of the Šu-Sin Sacred-Marriage hymns (ETCSL 2.4.4) — "Bridegroom, dear to my heart" (Šu-Sin B) is often cited as the world's oldest love-poem.