Updated list. There are 23 names here so far. I will let the list develop for another week or so, in case we have missed out anyone important. Then we will have to try and whittle it down to just twenty. After that I'll come up with a way of picking the FOG Top 5 Inspired Medieval Commanders.
Alfonso I of Aragon ("the Battler")
1073-1134, Crusader/"Reconquista", victor at Valtierra 1106, Zaragoza 1118 and Cutanda 1120.
Bolesław III Piast
1086-1138, Prince of Poland, victor at Hunsfeld and Glogow (both 1109), Trutina 1110 and conqueror of Pomerania by 1122.
Saladin
1138-1194, Sultan of Egypt and Syria, founder of Ayyubid dynasty, victor at Hattin and siege of Jerusalem both 1187.
Richard I of England ("the Lionheart")
1157-1199, King of England from 1189, Crusader, defeated rebellions in Aquitaine and Angouleme, victor at Messina 1190, in Cyprus 1191, at Arsuf 1191 and Gisors 1198.
Genghis Khan
1162-1227, founder of Mongol Empire, conqueror of Western Xia (by 1209) and Jin dynasties (by 1215), Kara-Khitan Khanate (by 1218) and Khwarezmid Empire (by 1221).
Alexander Nevsky
1220-1263, Prince of Novgorod and Vladimir, victor at Neva 1240 and Lake Peipus 1242.
Baibars
1223-1277, Mamluk, sultan of Egypt from 1260, victor at Ain Jalut 1260, Arsuf 1265, Haifa 1265, Taffa 1268, Antioch 1268, Ashkelon 1270, Elbistan 1277, defeater of Seventh Crusade led by Louis IX.
Charles of Anjou
1226-1285, King of Sicily from 1266 to 1282, Crusader, victor at Benevento 1266, Tagliacozzo 1268, re-conquest of Albania by 1272.
Edward I
1239-1307, King of England, victor at Evesham 1265, Crusader, conqueror of Wales 1282/3 and 1294, victor at Berwick 1296, Dunbar 1297 and Falkirk 1298.
Robert the Bruce
1274-1329, King of Scotland, victor at Bannockburn 1314.
Edward III
1312-1377, King of England, victor at Halidon Hill 1333, Sluys 1340, Crecy 1346 and Calais 1347.
Edward, the Black Prince
1330-1376, Prince of Wales, victor at Poitiers 1356 and Najera (Spain) 1367.
Bertrand du Guesclin
1320-1380, Breton, Constable of France, defender of Rennes, victor at Monteil (Spain) 1369, Pontvallain 1370, Chize 1373.
Jan Ziska
1360-1424, Hussite (Taborite), military innovator using war wagons as "tanks", unbeaten in battle, at Grunwald-Tannenberg 1410, leader in Bohemian and Hussite civil wars.
Timur (Tamerlane)
1336-1405, founder of Timurid Dynasty, conqueror of Volga Bulgarians, Persians, the Golden Horde, northern India, the Mamluks in Syria, Ottoman Turks in Anatolia, victor at Kondurcha River 1391, Terek River 1395 and Ankara 1402.
Dmitry Ivanovich Donskoy (Dimytry I)
Grand Prince of Moscow 1359-1389, victor at Kulikovo.
Owain Glyndwr
(?) 1359-1416 (?), the last Welsh Prince of Wales, superb guerilla leader, leader of the Welsh Revolt 1400-1412, never captured.
Henry V
1386-1422, King of England from 1413, victor at Agincourt 1415.
Murad II
1404-1451, Sultan of the Ottoman Empire from 1421, military reformer, conqueror of Anatolian Turks and Serbs, victor at Varna 1444 and 2nd Kosovo 1448.
Janos Hunyadi
1407-56, Regent-Governor of Hungary, victor at Semendria 1441, Nagyszeben and Iron Gates 1442, Sofia and Snaim 1443 and Belgrade 1456.
Stephen III
1433-1504, Prince of Moldavia, defender of Moldavian independence, victor at Baia 1467, Lipnic, 1470, Vaslui 1475 and Codrii Cosminului 1497.
Sten Sture the Elder
1440-1503, Regent of Sweden, victor at Brunkeberg 1471, vanquisher of Russians 1495-7.
Edward IV
1442-1483, King of England from 1461, victor at Mortimer's Cross 1461, Towton 1461, Barnet 1471 and Tewkesbury 1471.