Mother Nicoleta Sofia Arcalianu was a nun in the Romanian Orthodox Church (ROC). She was the mother superior at Holy Trinity Monastery in eastern Romania.
In June 2005, Arcalianu, the monastery’s priest, Father Daniel Petru Corogeanu, and the three nuns, Sister Adina Lucia Cepreaga, Sister Simona Bardanas and Sister Elena Otel, nailed Sister Maricica Irina Cornici to a cross as part of an exorcism ritual. Cornici died as a result.
Arcalianu was convicted for her role in the death in 2007 and sentenced to 6 years in prison. She was also excommunicated by the ROC.