Violence turns to hope as Sistani #39;s arrival in Najaf heralds peace &lt;b&gt;...&lt;/b&gt; Iraq #39;s leading Shia cleric, Grand Ayatollah Ali Husseini al-Sistani, reached an apparent agreement with the radical cleric Muqtada Sadr yesterday to end a three-week uprising by Sadr #39;s Army of Mehdi militiamen in Najaf.