Władysław I the Elbow-high of Kujawy, however, as he had two older half-brothers from Casimir’s second marriage to Constance of Wrocław: Leszek II the Black ("Leszek Czarny") and Ziemomysł. He was named after his uncle, his mother's brother Władysław, Duke of Opole. Already in contemporary sources he was nicknamed ""Łokietek"", a diminutive of the word "łokieć". It translates as "elbow" or "ell" – a medieval unit of measure similar to a cubit, as in "elbow-high". The origin of this nickname, as resulting from Władysław’s short stature, was explained only in the 15th century by historian Jan Dlugosz. In 1267, when Władysław the Elbow-high was
Yup'ik clothing the outstreched arm and hand; "cagner" (in Cup'ig) measurement between tips of fingers on opposing hands when arms are extended out from the sides of the body; "ikuyegarneq" (in Yup'ik) "ikuyegarner" (in Cup'ig) measurement from one's elbow to the end of his fist; "ikuyegneq" (in Yup'ik) measurement from one's elbow to end of his outstretched fingertips; "iqelqin" (in Yup'ik) measurement from the tip of one's thumb to the tip of one's index fingers are stretched out from each other; "itegneq" (in Yup'ik) measurement from tip of toes to end of heel; foot (in length); "it’ganeq" (in Yup'ik) measurement from tip