The previous Klausenberger Rebbe, Rav Yekusiel Yehuda Halberstam.
Without a doubt, the most inspiring individual who gave such chizuk in the most painful period in our history.
He lost 150 relatives, including 11 children during the Nazi Holocaust and continued being Mekadesh Shem Shomayim till the last day of his life.
His biggest revenge on the Nazis, he said was whenever he married off a child or grandchild ( he remarried after the war).