New York City ? The dispute was about ancient history. But the tactics someone used to cast aspersions on a prominent Judaic studies scholar couldn’t have been more modern.

New York University professor Lawrence Schiffman’s students and colleagues started getting panicked and confessional e-mails, in his name, that pointed them to blog posts accusing him of plagiarism. Prosecutors say the e-mails and website posts were a hoax created by a lawyer on an idiosyncratic mission: to champion his father and discredit Schiffman in a debate over the origin of the Dead Sea Scrolls.

The attorney, Raphael Golb, went on trial Tuesday on criminal charges of online impersonation and harassment for the sheer sake of coloring opinion. The case is a rarity: While impersonation claims have generated civil lawsuits, prosecutions are few unless phony identities are used to steal money, experts say.

Golb, 50, has pleaded not guilty to identity theft, criminal impersonation and other charges.