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Not a good OCR. Searching in google "Instabile est regnum" the result is:"instabile est regnum quod non dementia fovet", meaning something like "The realm which is not supported by INSANITY, is unstable", where the correct reading (which is correctly displayed goin to the link) is CLEMENTIA, "clemence".
Perhaps in case of scanning of books written with this font, groups CL/D must be checked before putting the book in the web.
Anyway, thanks to google books, a great instrument, which deserves to be improved.