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The churches placed themselves under the authority of a conservative Anglican bishop in Uganda. The diocese sued, arguing that the congregations' property was held in trust for the diocese and the Episcopal Church as a whole.
Trial courts had ruled for the three parishes but in June, a panel of the 4th District Court of Appeal in Santa Ana reversed those decisions.
Diocesan attorney John R. Shiner said Tuesday he was confident that the state Supreme Court would affirm the appellate court's decision, which was unanimous.
Eric Sohlgren, lead attorney for St. James, said he was encouraged by the high court's decision to review the case, and said it could affect trial proceedings for other churches embroiled in similar property disputes.
"We think it's an important step toward calming the legal turmoil created by the appellate court decision," Sohlgren said.