Dawid Mar Shimun (Syriac: ܕܘܝܕ ܡܪܝ ܫܡܥܘܢ) was a Assyrian military leader From World War I up until the Simele Massacre in 1933 when he was exiled to Cyprus along with his son Mar Eshai Shimun. His first hand experience and contribution during the years leading up to the family’s exile to Cyprus in 1933 cannot be overlooked, for his presence was common place beside the Patriarchs (Mar Benyamin Shimun XIX, Mar Paulos Shimun XXII and Mar Eshai Shimun XXIII) and his sister, Lady Surma.