Bohemian Civil War (Premysloides Dynasty)

     Combatants  Imperial Forces  Anti-Imperial Forces Commanders  Emperor Frederick II Hohenstauf (died)  Grand Councilor Henry I Wittelsbach <th style="text-align:left; font-weight:normal; background:#B4C5E3;" colspan="2">Strength <tr style="spacing-top:0px; spacing-bottom:0px; vertical-align:top; background:#F0F0F0;"><td style="border-top: 1px solid #999999; border-bottom: 1px solid #999999; border-right: 1px solid #999999;" class="infoboxcell" width="50%"> Imperial Forces (First Phase) At peak 87-100,000 soldiers and cavalry --- Imperial Forces (Second Phase) At peak 170,000 troops and cavalry <td style="border-top: 1px solid #999999; border-bottom: 1px solid #999999;" class="infoboxcell" width="50%"> Anti-Imperial Forces (First Phase) At peak 102-110,000 troops and cavalry --- Anti-Imperial Forces (Second Phase) At peak 160-175,000 troops and cavalry <th style="text-align:left; font-weight:normal; background:#B4C5E3;" colspan="2">Casualties and Losses <tr style="spacing-top:0px; spacing-bottom:0px; vertical-align:top; background:#F0F0F0;"><td style="border-top: 1px solid #999999; border-bottom: 1px solid #999999; border-right: 1px solid #999999;" class="infoboxcell" width="50%"> Total annihilation <td style="border-top: 1px solid #999999; border-bottom: 1px solid #999999;" class="infoboxcell" width="50%"> Heavy
 * Holy Roman Empire
 * Imperial loyalists
 * Hansa
 * Kingdom of Bohemia under Romanos rule
 * Czech loyalists
 * Roman Empire
 * Anti-Papal coalition
 * Kingdom of England
 * Eastern Coalition (Bulgaria, Mongolia)
 * Grand Commonwealth
 * France
 * Papal State
 * Bohemian insurgents
 * Imperial insurgents
 * Iberian Union
 * Italian states
 * Mamluk Egypt (naval support)
 * Enzo of Sicily (imperial commander) (wounded)
 * Manfred of Hohenstauf (heir) (killed)
 * Hansa councilors (killed)
 * Albert of Habsburg
 * Rudolph of Habsburg
 * Marshal Gerhard Libeck (killed)
 * Alexios Strategopulos (wounded)
 * Admiral Philantropenos
 * General Diogenes Martus (wounded)
 * Romanos V Angelos (in Constantinople)
 * Kublai Khan (wounded)
 * Konstantin I Tikh (killed)
 * Otto Welf (commander) (killed)
 * Heinrich Welf
 * Corso Donati
 * Eberhard I of Württemberg (killed)
 * Ulrich I of Württemberg (died)
 * Guy, Bastard of Flanders (killed)
 * Adolf of Nassau
 * Roger of Lauria (suicide)
 * Hugo of Sully (killed)
 * 20,000 Hohenstauf troops, mercenaries and cavalry
 * 6500 Roman expeditionary troops
 * 5000 Czech loyalists
 * 15,000 imperial loyalists
 * 8000 Hansa mercenaries
 * 12,000 Mongolians
 * 8500 Englishmen
 * 9000 Baltic troops
 * 3000 Bulgarian troops
 * 300 galleys of Imperial Fleet
 * 85,000 Hohenstauf Imperial Army troops
 * 45,000 loyalists
 * 2000 Roman expeditionary troops
 * 5000 Mongolian and Bulgarian troops
 * 20,000 English troops
 * 6000 Hansa mercenaries
 * 6000 Baltic troops
 * 250 galleys
 * 30,000 Commonwealth levies
 * 15,000 Bohemian rebels
 * 10,000 Imperial rebels
 * 8000 Iberian troops
 * 25,000 French troops
 * 14,000 Italian troops
 * 400 galleys
 * 20,000 Commonwealth levies
 * 35,000 Rebels (Bohemians and Imperials)
 * 5000 Iberian troops
 * 40,000 French troops
 * 25,000 Italian troops
 * 16,000 mercenaries
 * 15,000 Crusaders
 * 10,000 Papal Army
 * 600 galleys
 * 60,000 killed or wounded in First Phase
 * 100,000 killed or wounded in Second Phase
 * 1.9 million civilians killed or wounded
 * Destruction in value of One billion hyperpyrons ($50 billion)
 * Social collapse in North-East Germany and Bohemia
 * 50,000 killed or wounded in First Phase
 * 120,000 killed or wounded in Second Phase
 * 2.1 million killed or wounded civilians
 * Destruction in value of Ten billion hyperpyrons ($500 billion)
 * Total destruction of Empire rural and cities

Background
While originally known as "Hundred Years War", this name was overturn after Colonial Wars between Roman Empire and Sino Empire. First Pan-European War was bloodiest and most destructive conflict in European history, until Second Pan European War in 1755-1820. War happened during 1265-1369.

War was ignited by succession dispute in Kingdom of Bohemia. Bohemia was Holy Roman Empire state, but after death of King Wenceslas I and death of older heir Vladislau, only heir became Romanos V Angelos-Premysloides, which caused confusion among nobility. After short and friendly negotiations, Emperor Frederick II Hohenstauf granted independence for Bohemian Kingdom and Kingdom became Roman Empire exclave, in exchange for eternal military alliance. This situation however happened only for very short time.

Few weeks after negotiations, Bohemian Estates summoned Estates Diet. While burghers and city representatives supported Imperial rule and newly appointed King Romanos V, Roman Catholic Church and nobility representatives took anti-Imperial stances and asked German nobility in Holy Roman Empire to act against Frederick II who, according their violate nobility rights and even his own Golden Bull of Sicily.

Holy Roman Empire nobility summoned new faction called as "Grand Commonwealth" which was confederation of city-states, local duchies, noble dynasties, mercenaries, Papal supporters and other anti-Imperial forces. While Frederick II had strong position in Eastern and Northern Germany, he lost all his domains in Southern and Western Germany and Grand Commonwealth allied with French kings Philip III, the Bold and his son Philip IV, the Fair.

While Emperor Romanos did not ignited any large war himself, he sent numerous expeditionary corps to help his great-granduncle against Grand Commonwealth and their allies.

Phasical War
War itself is divided into three phases - First Phase during live of Emperor Frederick II and his son Manfred (from 1266 to 1315), "Frozen conflict" from 1316 to 1358 through era of "Dark Age" and Second Phase of years 1359 to 1369. While first phase was victorious for Frederick II and his allies, through Dark Age, most of their victories were lost and both side rose from Dark Age very weakened.

First Phase (1266 - 1315)
First Phase was characterized by local conflicts, Bohemian civil war and expansion of Roman Empire influence over Bohemia and Hungaria, while Hungary was not involved in much of war (except financing pro-Imperial forces). Frederick and Manfred, both, ruled with iron fist and focused on centralization of Empire and strengthening the Emperor's authority but it initiated a number of local rebellions of aristocrats and nobility.

Bohemian insurgency was not fully quelled by Imperial Army presence. While Emperor Romanos had full control over Prague and other important cities, most of rural areas were supporting local nobility and rebels against Emperor Romanos. That was problem, as most of Roman Expeditionary Corps was tied to Bohemia and could not help Frederick II in his struggle against Grand Commonwealth.

Early years of First Phase was also characterized by diplomatic negotiations between different parties when Emperors Romanos and Frederick were able to gain support of English Kings Henry III and Edward I, while Grand Commonwealth formed alliance with France and Iberian Union, with unsatisfied Italian states and Papal State.