Military engineering
Weyrother was born in Vienna as the son of cavalry "Major" (Major) Anton von Weyrother, who was Chief Rider of the Spanish Riding School in Vienna. After studying at the "Ingenieurakademie" in Vienna (Military engineering academy), he joined the army as a "Fahnencadet" (Academy graduate) in Infanterie-regiment Nr. 22 Franz von Lacy on 1 December 1775 as Lacy was his godfather. On 1 May 1777, he was promoted to "Fähnrich" (cadet officer or ensign) and on 16. November 1778 to "Unterlieutenant" (second lieutenant). In August 1779, he was chosen by "Generalmajor" Major General Graf Wenzel Colloredo as his adjutant and stayed in post until 1783. On 1 June 1784, he was promoted to "Oberlieutenant" and after his transfer on 1 August 1787 to Infanterie-regiment Nr. 2 Erzherzog Ferdinand, he served in the 1788—1790 Turkish War as Adjutant of "Feldmarschalleutnant" Maximilian Browne and on 1 February 1789, was appointed to "Capitain-lieutenant" (junior Captain) followed by "Hauptmann" (full Captain) on 6 July.