Final answer:
Charles I called back Parliament into session due to pressure from political allies.
Step-by-step explanation:
Charles, I called back Parliament into session for several reasons. One of the reasons was the pressure from political allies. After dissolving Parliament, Charles faced numerous challenges and difficulties. As a result, he realized that he needed the support and advice of Parliament to govern effectively. By calling back Parliament, Charles hoped to gain the assistance and backing of his political allies in overcoming these challenges.