Chatti in the context of "Cherusci"

Nero Claudius Drusus Germanicus (38–9 BC), commonly known in English as Drusus the Elder, was a Roman general and politician. He was a patrician Claudian but his mother was from a plebeian family. He was the son of Livia Drusilla and the stepson of her second husband, the Emperor Augustus. He was also brother of the Emperor Tiberius; the father of the Emperor Claudius and general Germanicus; paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.

Drusus launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers. In 12 BC, he led a successful campaign into Germania, subjugating the Sicambri. Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser. In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser. In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both. The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe. His Germanic campaigns were cut short in the summer of 9 BC by his death after a riding accident.

Marcus Didius Julianus (/ˈdɪdiəs/; 29 January 133 – 2 June 193) was Roman emperor from March to June 193, during the Year of the Five Emperors. Julianus had a promising political career, governing several provinces, including Dalmatia and Germania Inferior, and defeated the Chauci and Chatti, two invading Germanic tribes. He was even appointed to the consulship in 175 along with Pertinax as a reward, before being demoted by Commodus. After this demotion, his early, promising political career languished.

Julianus ascended the throne after buying it from the Praetorian Guard, who had assassinated his predecessor Pertinax. A civil war ensued in which three rival generals laid claim to the imperial throne. Septimius Severus, commander of the legions in Pannonia and the nearest of the generals to Rome, marched on the capital, gathering support along the way and routing cohorts of the Praetorian Guard Julianus sent to meet him. Abandoned by the Senate and the Praetorian Guard, Julianus was killed by a soldier in the palace and succeeded by Severus.

The Usipetes or Usipii (in Plutarch's Greek, Ousipai, and possibly the same as the Ouispoi of Ptolemy) were an ancient Germanic people who entered the written record when they encountered Julius Caesar in 56/55 BC when they attempted to find a new settlement west of the Rhine, together with the Tencteri, who were both attempting to move away from the aggressions of the Suevi on the east side of the Rhine. After the Romans slaughtered a great number of both tribes, they resettled on the east bank with the help of the Sicambri.

By about 100 AD, in the time of the Roman author Tacitus, the Usipii and Tencterii had moved southwards along the eastern bank of the Rhine into a position between the Chatti and the river. During the reign of Gallienus around 260-268 AD, the Laterculus Veronensis, reports that the Romans lost control of the Usipii lands, and after this they no longer appear in historical records.

The Batavians or Batavi were a Roman-era Germanic people that lived in Batavia in the eastern Rhine delta — an area that is now the Netherlands, but then lay upon the northernmost border of the Roman Empire in continental Europe. Their origins are uncertain, but they appear to have settled in Batavia around 50–15 BC, when a Rome-allied Chatti military elite joined a Celtic-influenced community that had already been living there long before the arrival of the Romans. Throughout the several centuries in which they appear in historical records the Batavians were continually associated with elite cavalry units in the Roman military, who were famous for their ability to cross rivers while armed and on horseback, without breaking line.

Batavia was already referred to by the Roman leader Julius Caesar as the "Island of the Batavi" (Latin: Insula Batavorum) in his account of his campaigns in Gaul in 58–52 BC — although he did not explain who the Batavi were. Tacitus, writing in about 100 AD, reported that they had a special old alliance (antiquae societatis) with the empire as major contributors to the Roman military, and they did not pay any other form of tribute or tax. Some modern scholars have suggested that this relationship was established by Caesar himself who had a Germanic cavalry unit which fought for him in Gaul, and then in his Roman civil war. According to these proposals, this force evolved into the later bodyguard of Caesar's imperial successors in the Julio-Claudian dynasty, who continued to recruit Batavians for this role.

The Irminones, also referred to as Herminones or Hermiones (Ancient Greek: Ἑρμίονες), were a large group of early Germanic tribes settling in the Elbe watershed and by the first century AD expanding into Bavaria, Swabia, and Bohemia. This included the large sub-group of the Suevi, that itself contained many different tribal groups, but the Irminones also included for example the Chatti.

The term Irminonic therefore is also used as a term for Elbe Germanic, which is one of the proposed (but unattested) dialect groups ancestral to the West Germanic language family, especially the High German languages, which include modern Standard German.

The Mattiaci were by Tacitus recorded as an ancient Germanic tribe and related to the Chatti, their Germanic neighbors to the east. There is no clear definition of what the tribe's name meant. The Dictionary of Greek and Roman Geography suggests that the name is derived from a combination of 'matte', meaning 'a meadow', and 'ach' (pronounced with the 'ch' as in 'loch'), signifying water or a bath.

The Mattiaci were settled on border of the Roman Empire on the right side of the Rhine in the area of present-day Wiesbaden (Aquae Mattiacorum), the southern Taunus, and the Wetterau. Archaeological evidence of Wiesbaden cannot prove their alleged origin. While the worship of various Gaulic deities like Sirona or Epona is attested, there is so far no evidence for Germanic gods nor for specific products of Germanic origin.