Seeing a whole class of children pile into his museum about a Russian prince's 13th-century victory over Western crusaders, historian Vladimir Potresov was delighted.

Seeing a whole class of children pile into his museum about a Russian prince's 13th-century victory over Western crusaders, historian Vladimir Potresov was delighted.

SAMOLVA: Seeing a whole class of children pile into his museum about a Russian prince’s 13th-century victory over Western crusaders, historian Vladimir Potresov was delighted. His…