Question 1
During the Roman rule, Scotland refers to the historical period under the rule of the Roman Empire, now known as Scotland. The first Romans came to Rome in 71 AD and defeated the Celtic tribes in Britain.
The Romans, commanded by Gnaeus Julius Agricola and Quintus Petillius Cerialis, who decided to take the island they had named Albion, won an important victory at the Battle of Graupius Mountains in 84 AD. Although Hadrian's Wall and the Antoninus Wall in its north have been tried to be acquired, Roman dominance has never been effective in modern Scotland. After 221 AD, it became an insignificant force in the region.
Question 2
The Antoninus Wall had its objectives besides defending against the attacks of the Caledonian. The Maeatae tribe between the two walls was cut off from the other Celts and a buffer zone was formed in the north of Hadrian's Wall. However, Rome's success is short-lived, with 12 years of built-up fortification being overrun and abandoned in 160 AD. Constructions that are a source of prestige for a period are left to their fate when they have completed their useful life.
There was no indirect benefit such as the collection of military intelligence on the wall, which is the most important defense, and the collection of customs tax. This fortress, which gave fear to the enemies by the scale, was also a demonstration of the prestige of Rome. The Wall separated the Romans and the Celts in Britain until AD 139. Antoninus Wall has taken his place for a short time.
Q1
I am not really sure how your answer explained why the Picts could not be subjugated by the Romans.
Q2
Hadrian’s Wall was started sometime around 117AD and completed around 128AD. It was in use until the fall of the Empire in 410AD. It had its peaks and troughs of use during this period whether behind the lines or as the northern defensive line. It also got over-run at times.
Thanks for your input.