Frail but beaming, Alaa Abd El Fattah, Egypt’s most prominent political prisoner, returned home and to his mother’s arms early Tuesday morning after Egypt’s president issued a pardon a day earlier. His reunion with his family caps a yearslong campaign joined by world leaders, Nobel laureates and celebrities to win the freedom of one of Egypt’s most well-known pro-democracy activists from the 2011 Arab Spring protests. On Monday, Egypt’s president, Abdel Fattah el-Sisi, pardoned Mr. Abd El Fattah, who spent most of the last 12 years in jail, along with five other prisoners. Mr. Abd El Fattah, 43, was released from a previous prison sentence in 2019, only to be rearrested six months later. He had been in jail ever since.