Oleum is also known as fuming sulphuric acid or Nordhausen acid. It has a chemical formula of H2S2O7, and can be formed by dissolving excess sulphur trioxide[?] into sulphuric acid. See sulphuric acid for more information.
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... Agnes
near Zwolle where his brother John had been before
him and had risen to the dignity of prior. Thomas
received priest's orders in 1413 and was made
subprior ...