Baron Louis Gerard De Geer af Finspång was a Swedish statesman, lawyer, and writer who served twice as Prime Minister for Justice from 1858 to 1870 and from 1875 to 1876; in 1876, he became the first Prime Minister of Sweden, serving until 1880. De Geer was the principal architect of the 1865 representation reform, replacing the Riksdag of the Estates with a bicameral parliament and playing a pivotal role in modernizing Swedish politics.