▁of ▁ 1 3 5 0 , ▁the ▁Black ▁Death ▁– ▁which ▁had ▁been ▁ra ging ▁through ▁western ▁Europe ▁for ▁the ▁previous ▁two ▁years ▁– ▁appeared ▁in ▁the ▁camp . ▁The ▁out break ▁caused ▁pan ic ▁as ▁increasing ▁numbers ▁of ▁Cast ilian ▁troops ▁began ▁dying ▁from ▁the ▁pl ague . ▁The ▁gener als , ▁nobles ▁and ▁ladies ▁of ▁the ▁royal ▁household ▁begg ed ▁Alfonso ▁to ▁call ▁off ▁the ▁sie ge , ▁but ▁the ▁king ▁refused ; ▁according ▁to ▁the ▁Cast ilian ▁chron ic lers , ▁he ▁drew ▁his ▁sword ▁and ▁declared ▁that ▁he ▁would ▁not ▁leave ▁until ▁Gib ral tar ▁was ▁under ▁Christian ▁rule ▁again . ▁As ▁the ▁Chron ica ▁de ▁Alfonso ▁XI ▁puts ▁it , ▁ ▁Alfonso ' s ▁determ ination ▁was ▁soon ▁to ▁cost ▁him ▁his ▁life . ▁The ▁Chron ica ▁records ▁that ▁" it ▁was ▁the ▁will ▁of ▁God ▁that ▁the ▁King ▁fell ▁ill ▁and ▁had ▁the ▁sw ell ings , ▁and ▁he ▁died ▁on ▁Good ▁Friday , ▁ 2 7 ▁March ▁of ▁the ▁year ▁of ▁our ▁Lord ▁Jesus ▁Christ ▁ 1 3 5 0 ." ▁His ▁death ▁meant ▁the ▁immediate ▁end ▁of ▁the ▁sie ge . ▁He ▁was ▁the ▁only ▁medieval ▁monarch ▁to ▁die ▁of ▁the ▁pl ague . ▁Y us uf ▁I , ▁who ▁had ▁been ▁organ ising ▁a ▁relief ▁force , ▁let ▁the ▁Cast ili ans ▁withdraw ▁in ▁peace , ▁while ▁the ▁Mo or ish ▁g arrison ▁of ▁Gib ral tar ▁left ▁the ▁safety ▁of ▁the ▁town ▁walls ▁to ▁bid ▁fare well ▁to ▁the ▁Cast ilian ▁king