Final answer:
The Byzantine emperor was unhappy with the development of Outremer because the crusaders did not return control of captured territories as promised, leading to a breach of trust and loss of territory. Internal conflicts within the empire and the crusaders' own infighting exacerbated the situation.
Step-by-step explanation:
Byzantine Emperor's Unhappiness with Outremer
The Byzantine emperor was unhappy with the development of Outremer mainly because the crusaders had not honored their commitments. Despite initial agreements, crusaders who participated in the First Crusade did not return important cities such as Antioch or other conquered lands in the Middle East to the Byzantine Empire. This action breached the trust between the crusaders and the Byzantine Empire and deprived the empire of valuable territory that it expected to regain. Additionally, the Byzantine emperors struggled with internal conflicts and relied on the dynatoi, local elites, who sought to exploit the empire's weakened state, furthering the emperor's dissatisfaction with the situation.
The military front was equally challenging. The European aristocrats and knights, eager to claim lands for themselves, frequently clashed among each other, even when faced with a common enemy. This infighting weakened their overall defensive capabilities, leading to an acute need for more soldiers to protect their newfound territories.
Subsequent Byzantine rulers also faced a myriad of threats and betrayals, including the Fourth Crusade's sacking of Constantinople in 1204, which solidified the deep-seated resentment towards the Catholic crusaders amongst the Orthodox Christians. These combined factors contributed to the Byzantine emperor's distress over Outremer's development.