PHILADELPHIA (AP) - A Native American archbishop takes the helm this week of the nation's sixth-largest Roman Catholic archdiocese at perhaps the most troubled time in its modern history, as it defends the first criminal indictment ever filed against a U.S. church official over the priest-abuse scandal.

Archbishop Charles Chaput, 66, will be installed Thursday to lead a Philadelphia archdiocese of nearly 1.5 million Catholics rocked by two scathing grand jury reports in 2005 and 2011 that claim the church concealed sex-abuse allegations for decades and transferred pedophile priests to unsuspecting parishes. Other troubles decades in the making include declining Mass attendance and clerical ranks and shuttering of schools and churches.

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