A Catholic museum in East Harlem is accused of illegally exhibiting a 17th-century painting that belongs to a California lawyer.

Barney Shiotani’s Manhattan federal court suit says “unknown third parties” obtained Anthony van Dyck’s “Betrayal of Christ” through “theft, conversion or fraud” and transferred it to the National Museum of Catholic Art and History. A spokeswoman for the now-closed museum said it was a “misunderstanding.”