I have a pressure cooker in my underground lair

I have a pressure cooker in my underground lair that is brewing a
diabolical solution. I set everything up and went upstairs, but forgot to write down the initial temperature. I know the starting volume was 1.00 L. When I came downstairs later to check on it, I see that the volume increased to 1.10 L, and thermometer read that the temperature was now 528.15 K. What was the starting temperature when I left (in °C)?

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