A vassal state is any state that has a mutual obligation to a superior state or empire, in a status similar to that of a vassal in the Feudalism in Middle Ages Europe. Vassal states were common among the empires of the Near East, dating back to the era of the Ancient Egypt, Hittites, and Mitanni conflict, as well as in ancient China.
The relationships between vassal rulers and empires were dependent on the policies and agreements of each empire. While the payment of tribute and military service was common amongst vassal states, the degree of independence and benefits given to vassal states varied. Today, more common terms are puppet state, protectorate, client state, associated state, or satellite state.
Much of what is known about Egypt's vassal states from the reigns of Amenhotep III and Tutankhamun (1390 BC – 1323 BC) stems from the Amarna letters – a collection of 350 cuneiform tablets. The different ways vassal rulers communicated with the Pharaoh via grovelling and obsequiousness is a key method of extrapolating relationships between Egypt and vassal states.
Egypt's key vassal states were located on the northern frontier, and included states such as Nuhašše, Qatna, and Ugarit. These were located on the fringes of the territory claimed by Egypt and were a potential threat from acting with the Hittites in Anatolia, or the Mitanni in Iraq and Syria. Due to these vassal states’ distance from the Nile, and their value as a buffer zone from rival kingdoms, these states appeared to have a more high-status relationship with the Pharaoh and Egypt. These states could also solicit the Pharaoh for various requests. The fulfilment of these asks by Egypt may have served the purpose of ensuring the loyalty of these distant vassal states. However, these vassal states were claimed by the Hittite Empire following the death of Akhenaten (1353 BC – 1336 BC) and were never reclaimed.
Under Ramesses II (1279 BC – 1213 BC), Egypt engaged in several military campaigns against the Hittites, eventually capturing the kingdoms of Kadesh and Amurru kingdom by taking advantage of growing problems in the Hittite Empire. In 1258 BC, Ramesses and the Hittite King Ḫattušili III signed a peace treaty that created a border from north of Byblos to Damascus between the two empires.
Correspondence with the Kingdom of Byblos is well documented, as the longest interaction between Egypt and a vassal state and spanned a period of 12 years. The subject king in these letters – Rib-Hadda – is unique among vassal rulers as his letters are more verbose than other small rulers in the Near East. Despite his loyalty to the Pharaoh, Rib-Hadda never received any meaningful reply from Egypt during times of need and was eventually exiled from his own kingdom by his brother.
While Rib-Hadda's brother was on the throne, Byblos continued to communicate with the Egyptians, although there is some contention over potential alliances between Byblos and Amurru and the Hittite Empire as well.
Interactions between Byblos and Egypt declined in the 12th and 11th centuries BC with the fall of the New Kingdom. Following Egypt's resurgence, kingdoms such as Tyre and Sidon were favoured over Byblos. By the Early Iron Age, Byblos no longer had connections to any great powers in the region. While the city still had religious authority until the Roman Empire, it had long lost its economic and political importance.
In rare cases, local rulers were given kiurwana (protectorate status). While they had distinct privileges such as exemption from tribute they did not have any more freedom of activity than other vassal states. All relations among the regions under Hittite control were strictly determined by the king. While this led to the belief that contact between vassal states was limited, it has also been thought that such restrictions were limited to the enemies of the Hatti.
The treaties imposed on vassal states came with military obligations, though vassals were also promised military assistance in return. Some treaties also contained details of annual tribute. Treaties were often concluded with a marriage between a vassal ruler and a Hatti princess of the royal family. The princess would hold greater power than other wives of the vassal, and succession would pass down her descendants.
Vassal states were obliged to support and swear fealty to the king's legitimate successors as well. In the event of a usurper taking the throne, the vassal state was freed from all treaty obligations except to help restore a legitimate king to the throne. In doing so, vassal rulers were guaranteed sovereignty from themselves and their successors in their region.
Assyrian kings expressed their hold over vassal states through the collection of flora and fauna from these regions. The earliest records of this practice date back to Tiglath-Pileser I (1114 BC – 1076 BC) in the Middle Assyrian Period. It was revived by Ashurnasirpal II in the Neo-Assyrian Period by creating a garden with specimens from across the empire. Later Neo-Assyrian rulers would expand on this practice; Sargon II created a garden that imitated the forests of Northern Syria, while Sennacherib created a swamp that reflected the landscape of Southern Babylonia. In artistic representations, subjects of vassal states are depicted bringing tribute to Assyria. These representatives are shown bowing or crouching before the king. The gifts offered range from horses and monkeys to wineskins. These scenes of tribute and audience with the king express how vassal states participated in the Neo-Assyrian Empire.
By the 8th century BC, the southern vassal states of the empire saw an increase in settlement. In comparison to the northern regions of the empire – which were previously devastated – these kingdoms become denser and the more prosperous parts of the empire. The kingdoms west of the Euphrates river were considered vassal states until the 7th century BC, when they were incorporated into the proper provincial system of the empire, though they still had various degrees of political control depending on location. In Judah, there was a further increase in settlement in the 7th century that was greater than the 8th. It was the same in Jordan, showing that Neo-Assyrian control over the region was a successful period for these kingdoms.
Another region considered a vassal state rather than a satrap was Arabia. According to Herodotus, they aided Cambyses II in his invasion of Egypt (525 BC). As such, Arabia did not become a satrap and was exempt from paying annual tribute. Instead, they are attested to in the Behistun inscription and in the Persepolis Fortification Tablets as providing 1000 talents per year. In Xerxes’ invasion of Greece, Herodotus mentions the Arabians among the different sections of the Persian Army as being led by Arsamenes – the son of Darius I.
Despite the size of the Achaemenid Empire, there was efficient communication and connectivity between different regions. The Royal Road which ran through most of the empire allowed for the movement and sharing of goods, culture, and ideas between the Achaemenid satraps and vassal states.
These ranged in size from small city states to vassals which controlled large swathes of territory such as the states of Chu and Qi. One of these vassal states would go on to conquer China and unite the country under the first emperor Qin Shi Huang.
During the 18th century, the Ottoman Empire controlled many vassal and tributary states such as the principalities of Wallachia and Moldavia, the Crimean Khanate, and as far away as the Aceh Sultanate.
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