List of governors of Illinois
The governor has the power to either approve or veto bills passed by the Illinois Legislature, to convene the legislature, and to grant pardons, except in cases of impeachment.The longest-serving governor was James R. Thompson, who was elected to four terms lasting 14 years, from 1977 to 1991.Only one governor, Richard J. Oglesby, has served multiple non-consecutive terms, having been elected in 1864, 1872, and 1884.[20] Governors were not allowed to succeed themselves[19] until the 1870 constitution, which removed this limit.[22] The 1848 constitution changed this to say the power "devolves" upon the lieutenant governor in case of a vacancy.