Long ago, there was a king. 
Long ago, a man named Gallienus led a big land. 
It was a very busy time. Many groups tried to take his place. 
He won many fights against tribes. He kept his lands safe for a long time. This was his longest rule.
But some lands broke away from him. He could not stop them from leaving. 
At the end, some people were not kind to him. He died during a fight for power. He was a leader for many years.
Gallienus was a Roman emperor. He ruled from 253 to 268. His father, Valerian, was also an emperor. They shared the work of ruling the empire. 
His time as leader was very difficult. Many people tried to take his power. These people were called usurpers. Gallienus fought many wars to stay in charge. He won many battles against Germanic tribes. 
But things were still hard. His father was captured by the Sasanian Empire. This caused a lot of chaos. 
Gallienus ruled for 15 years. This was a long time for that era. At the end, he was killed by an officer. This happened during a fight for power. 
Gallienus was a leader of the Roman Empire. He ruled from 253 to 268. His father, Valerian, was also an emperor. They shared the work of ruling together. 
Ruling the empire was a very hard job. Gallienus faced many threats at once. Many people tried to take his power. These people were called usurpers. He had to fight many wars to keep control. 
Gallienus came from a wealthy family. His father was the emperor Valerian. His mother was named Mariniana. 
Many things went wrong during his rule. In 260, the Sasanian Empire captured Valerian at Edessa.
Life in the Roman Empire was always changing. Gallienus lived during a time called the Crisis of the Third Century. This was a period when the empire almost fell apart. 
Publius Licinius Egnatius Gallienus was a Roman emperor who ruled from 253 to 268. He lived during the Crisis of the Third Century. This was a dangerous period when the Roman Empire nearly collapsed. Gallienus ruled alongside his father, Valerian, for seven years. After Valerian was captured, Gallienus ruled alone for eleven years. His 15-year reign was the longest in fifty years. 
Gallienus was born into a wealthy senatorial family. His father was Emperor Valerian and his mother was Mariniana. Some inscriptions suggest he may have been born in Falerii. He married Cornelia Salonina about ten years before he became emperor. 
When Valerian became emperor in 253, he and Gallienus divided the empire. This division was necessary because the empire was massive. It also helped them manage many different threats at once. Valerian went to the East to face the Sasanian Empire. Gallienus stayed in the West to defend against Germanic tribes. He spent much of his time in the Rhine provinces, such as Germania Inferior and Germania Superior.
Gallienus faced many internal threats from people called usurpers. A usurper is someone who tries to take imperial power illegally. Between 258 and 260, a governor named Ingenuus declared himself emperor. Gallienus reacted quickly by crossing the Balkans. He led a new cavalry corps called the comitatus to defeat Ingenuus at Mursa. 
External invasions also pressured the empire's borders. Germanic tribes like the Franks and the Alemanni attacked Roman lands. The Franks broke through the Rhine and reached as far as southern Spain. The Alemanni invaded through the area between the Rhine and the Danube. They even entered Italy, which had not happened in 500 years. 
In the East, the situation was even more difficult. In 260, the Sasanian Empire defeated the Romans at the Battle of Edessa. The Sasanian ruler, Shapur I, captured Emperor Valerian. 
Gallienus's life ended during a siege in 268. A usurper named Aureolus had declared himself emperor in Mediolanum. Gallienus defeated Aureolus outside the city and began a siege. During this time, Gallienus was assassinated by an officer named Cecropius. This was part of a conspiracy. His death marked the end of a long and difficult era of Roman history. 
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