| Monbana Empire |
|Capital|| Torenya (4319–3614; 3428–3258 AK)|
Kartasikum (3614–3428; 3276–2797 AK)
|Government|| Absolute monarchy (4319–4172; 3867–3428)|
Directorial republic (4172–3867; 3428–2797)
|-||4319–4279 AK||Saderus I (first)|
|-||3442–3428 AK||Saderus XI (last)|
|-||Norus becomes High Councillor||2 Luksaris 4322 AK|
|-||Norusi Proclamation||1 Anaris 4319 AK|
|-||Overthrow of Dinderus III||23 Sularis 4172 AK|
|-||First Shattering||3881–3867 AK|
|-||Reunification under Sansus||25 Terysis 3867 AK|
|-||Overthrow of Saderus XI||19 Anaris 3428 AK|
|-||Great Shattering||3276–3258 AK|
|-||Fall of Torenya||29 Kalleris 3258 AK|
|-||Fall of Kartasikum||23 Terysis 2797 AK|
The Monbana Empire (Monbana: Basela Monbana) was the post-Confederation period of the ancient Monbana civilisation. The Empire's form of government alternated between absolute monarchy under the Kings of Monba and directorial republicanism under the Landa through its 1,500 years. Under imperial rule, Monbana territory expanded to cover the vast majority of Korat, at its peak occupying 6.4 million square kilometres. The population grew to an estimated 50 to 90 million inhabitants (roughly 30% of Darya's population at the time). The 700-year-old Confederation that preceded it was severely destabilised in a series of civil wars and political conflict, during which General Oranus Ternolus Esh'okulī was appointed High Councillor for Life. Esh'okulī gradually accumulated power, siphoning it away from the Landa. This power was inherited by their eldest child, Norus Oranolus, who after an assassination attempt by 5 Councillors in 4320 AK effectively stripped all remaining authority from the Landa, making themselves an absolute ruler. On 1 Anaris of the next year, Norus established the Empire. They were conferred the title of Saderus (lit. "Majesty") by their new, loyalist Landa in 4318, and they thus became Saderus I, Monba's first King.
The imperial period of Monba lasted approximately 1,500 years compared to the 700 years of the Confederate era. The first century of the Empire's existence was a period of unprecedented political stability and prosperity known as the Barum Monbana, or "Monbana Peace". Following Saderus' accession, expansion of the empire accelerated rapidly, and a vast number of new colonies were founded throughout Korat with varying levels of success. After the violent deposition of Dinderus III in a popular revolution, the Landa had the imperial powers returned to it, beginning what was effectively a continuation of the old Confederation. The First Republic era was brought to an end in 3881 when conflicts between a number of Landon devolved into a devastating civil war known as the First Shattering. After fourteen years of war, Sansus Renolus reunified the feuding realms of the Empire, restoring the monarchy as King Sansus I and establishing the Sesvōnī dynasty. Under their successor, Saderus IV, the Empire engaged in several wars against a number of countries in the neighbouring continent of Maran, including the Kingdom of Zhang and Meryo Empire. The incursions into Meryo was ultimately unsuccessful, but Zhang after a swift invasion in 3825 surrendered and was absorbed into the Empire. This was the first major expansion since Saderus I, and it was through it that Monba reached its greatest extent.
A period of increasing trouble and decline began with the reign of Sansus V. After they died in 3656 AK, the Empire was divided among their four children, beginning a period known as the Tetrarchy. In 3654, Meryo invaded former Zhang territory, then under the control of King Norus Sansolus; in 3652 they became a vassal of Meryo. Meryo went on to attack the other three realms of Monba, subduing all but one, the Eastern Empire ruled by Lukarus. The war culminated in the Siege of Torenya in 3647, during which the city was burnt to the ground by the invaders. The Monbana eventually prevailed, with uprisings all over occupied Monba distracting the Meryo armies, allowing Lukarus' forces to recover and strike back. While the Meryo were ultimately expelled from Korat, they retained control over Zhang, ending Monbana presence in Maran. Under Lukarus, Torenya was rebuilt using brick and marble and a strict grid format, creating the foundations of the modern city.
While peace remained during the rule of Lukarus and their two surviving siblings, under their successors relations between the three thrones degraded, leading to a civil war that was ended by Kartas the Great, who defeated their cousins and became the sole ruler of the empire in 3620. Kartas subsequently established a new capital city in Maviba, which he renamed Kartasikum. The imperial court remained there until 3428, when Saderus XI was overthrown by the Landa, which reestablished its collective rule over the Empire after 440 years of monarchy. After the collapse of the monarchy, the government was moved back to Torenya. However, the Landa was never as strong as it was before the rise of the Sesvōna dynasty, and it was often dominated by regionalism and internal conflicts. This led to the gradual decentralisation of imperial governance and the rise of the Eight Councils. In 3258, a final civil war ended with the Great Shattering — a permanent division of the Empire between the Eight Councils into the Eight Realms. The dominion of the Eastern Realms was gradually eroded by abuses of power, further civil wars, barbarian migrations and invasions, military reforms and economic depression. The Fall of Torenya in 3258 marked the end of the last of the five Realms in the east. Meanwhile, in the west, the three remaining Realms were eventually reunified under the government of Kartasikum, and the resulting Western Monbana Empire (in modern historiography called the Kartasiki Empire) endured for another 500 years as one of the leading powers in the world alongside its ancient arch-rival Meryo. Eventually, Kartasikum fell to the Domkaba in 2797, who ultimately transformed it into the Mavibi Empire.
The Monbana Empire was among the most powerful economic, cultural, political and military forces in the world of its time. It was one of the largest empires in Darsi history prior to the unification of the planet in 160 TE. At its height under Saderus IV, it covered 6.5 million square kilometres, and held sway over an estimated 70 million people. The longevity and vast extent of the empire ensured the lasting influence of the Monbana language, culture, religion, inventions, architecture, philosophy, law and forms of government on the empire's descendants. Throughout the Korata medieval period, attempts were even made to establish successors to the Monbana Empire. By means of Korata colonialism and their descendant states, Monbana and Sommizoli culture was exported on a worldwide scale, playing a crucial role in the development of modern Darya.