Peter in the field
Yes, Peter the Great did lead many of armies personally. While a young man he took a great interest in the science of artillery and the study of logistics. He led an assault on Azov, led the armies at Poltava, etc. In fact, it has his engineering plan that led to the construction of redoubts at Poltava. He took great pride in his military learning, and worked his way up the ranks, despite being tzar, serving variously as engineer, sailor, cannoneer, cavalryman, etc.
He was also almost captured when the Turks surrounded his army on the Pruth River. Charles XII, then in Turkey, thought this would be a great opportunity for the Turk to help him regain his northern provinces. The Turks settled for a two-star peace - a Crimea province and reduced fortifications.
In fact, as far as I know, all the monarchs listed in the xls file did some field commanding, though not all very extensively. Henry VIII led a brief campaign early in his reign, and Henry VII avoided the field once the throne was secure. The Turkish sultans until Selim the Sot were quite pleased to be on the field. Surely the military bug affected more monarchs than the Swedes and Poles, though, which is how the original leader list appeared.
Once again, great job on the IGC. My current campaign is running into serious trouble from inflation (35%!) and Dutch rebellion. Never had so much fun.
Porcius