The Italian film Sacro GRA became the first documentary to win the top prize at the world's oldest film festival, while Taiwanese director Tsai Ming-liang was also honoured at the prestigious Venice event. Tsai, a former Golden Lion winner, landed a Grand Jury Prize at the 70th Venice Film Festival for Stray Dogs, the slow-moving story of a homeless father who earns a meagre living as a human billboard while his children wander the streets of Taipei.