- year ▁reign . ▁H ui ▁Z ong ▁assumes ▁the ▁honor ary ▁title ▁of ▁Ta ish ang ▁Hu ang ▁( or ▁" Ret ired ▁Emperor "). ▁ ▁Jin – S ong ▁War : ▁J urch en ▁forces ▁reach ▁the ▁Y ellow ▁River ▁Valley , ▁two ▁days ▁after ▁New ▁Year . ▁Rem n ants ▁of ▁the ▁court ▁fle e ▁south , ▁including ▁much ▁of ▁the ▁popul ace , ▁and ▁communities ▁such ▁as ▁the ▁Ka if eng ▁Jews . ▁ ▁January ▁ 3 1 ▁– ▁J urch en ▁forces ▁lay ▁sie ge ▁to ▁Ka if eng . ▁Q in ▁Z ong ▁negoti ates ▁the ▁terms ▁of ▁surrender , ▁agree ing ▁an ▁annual ▁in dem n ity . ▁He ▁orders ▁Song ▁forces ▁to ▁defend ▁the ▁pre fect ures ▁of ▁the ▁Northern ▁Song . ▁▁ ▁By ▁topic ▁▁▁ ▁Liter ature ▁▁ ▁Adel ard ▁of ▁Bath , ▁an ▁English ▁phil os opher , ▁transl ates ▁Mu ḥ amm ad ▁ibn ▁M ū s ā ▁al - K hw ā riz m ī ' s ▁arithmetic ▁and ▁astronom ical ▁works ▁into ▁Latin . ▁ ▁Two ▁previously ▁written ▁Chinese ▁ph arma ce ut ical ▁works , ▁one ▁by ▁Sh en ▁Ku o ▁and ▁the ▁another ▁Su ▁Sh i , ▁are ▁combined ▁in ▁one ▁written ▁work . ▁▁ ▁Religion ▁▁ ▁O leg arius , ▁arch bishop ▁of ▁Tar rag ona , ▁creates ▁a ▁community ▁of ▁kn ights ▁( known ▁as ▁the ▁" Con fr atern ity ▁of ▁Tar rag ona "), ▁to ▁combat ▁the ▁Al mor av ids ▁in ▁Catal onia