"Seeking the Truth about Chronology Today"
The most likely solution is September 14th, 1221.
1 – Sun in Leo.
2 – Moon in Leo.
3 – Mars in Leo.
4 – Mercury in Leo/Virgo.
5 – Venus in Leo/Virgo.
6 – Jupiter in Leo/Virgo.
7 – Saturn in Leo.
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References;
1 – http://chronologia.org/zodiaki_eg_eu/z3_01.html