Upon William 's accession , Württemberg was suffering crop failures and famine in the " Year Without a Summer " , in 1816 . After taking office , he initiated sweeping reforms , resulting in the approval of the Estates of Württemberg to a constitution on September 25 , 1819 . In his 48-year reign , the kingdom moved from one that was created from different denominational principalities and a heterogeneous agricultural country , into a constitutional state with a common identity and a well-organised management
Year Without a Summer
Year Without a Summer
William I of Württemberg