Queen Fatuma
... that to ensure the loyalty of Queen Fatuma, a client ruler of Zanzibar, Omani forces kept a cannon trained on her palace?
... that to ensure the loyalty of <b id="mwCW4"><a href="./Fatuma_binti_Yusuf_al-Alawi" id="mwCW8" rel="mw:WikiLink" title="Fatuma binti Yusuf al-Alawi">Queen Fatuma</a></b>, a <a class="mw-redirect" href="./Client_ruler" id="mwCXA" rel="mw:WikiLink" title="Client ruler">client ruler</a> of Zanzibar, Omani forces kept a cannon trained on her palace?