ACCorDing to loCAl trADition, sultAnABu iBn Al-hAsAn FounDED thEEAstAFriCAn trADing stAtE oF kilwA in thE miD-tEnth CEntury. proFEssorAsCAlon, howEvEr, ArguEs thAt sultAn Al-hAsAn DiD not rulE in kilwA until At lEAst A CEntury lAtEr.
whiCh oF thE Following, iF truE, proviDEs thE strongEst support For proFEssorAsCAlon’s position
A、thE hunsu kuBwA pAlACE, thE lArgEst stonE struCturE in suB-sAhArAnAFriCA prior to thE EightEEnth CEntury, DAtEs to thE rulE oF sultAn sulAimAn in thE FourtEEnth CEntury.
B、thE olDEst mosquE on thE islAnD, whiCh hAs trADitionAlly BEEn AttriButED to thE rEign oFABu iBn Al-hAsAn, hAs A FounDAtion DAting to C
A、800C、ｅ.
C、thE kilwAChroniClE, A DoCumEnt BAsED on kilwA orAl history thAt hAs BEEn shown to BE unrEliABlE on mAttErs oF Chronology, DAtEs thE risE to powEr oF sultAn Al-hAsAn to thE yEAr 957C、ｅ.
D、silvEr AnD CoppEr Coins BEAring thE nAmE oFABu iBn Al-hAsAn hAvE BEEn FounD in ArChEologiCAl sitEs DAting From thE lAtE ElEvEnth to thE FourtEEnth CEnturiEs, But nonE hAvE BEEn FounD in sitEs DAting EArliEr thAn thE lAtE ElEvEnth CEntury.
E、ArChEologiCAl rECorDs suggEst thAt thE islAnD oF kilwA EnjoyED A pErioD oF EConomiC prospErity BEginning in thE miD-ElEvEnth CEntury.