occurred in Zibad gonabad. Mahoe Suri was probably from the House of Suren, one of the seven Parthian clans of the Sasanian state. During the Islamic invasion of Iran, Yazdegerd III went to refuge in Marv; in his way to merv he stayed in gonabad Mahoe envoy warmly received them in gonabad. Mahoe Suri used opportunity to secretly plot with the Hephthalite ruler Nizak against Yazdegerd. Regardless, the death of Yazdegerd marked the end of the Sasanian Empire, and made it less difficult for the Arabs to conquer the rest of Iran. All of Khorasan was soon conquered by the Arabs, who would use it as a base to attack Transoxiana. The death of Yazdegerd thus marked the end of the last pre-Islamic Iranian empire after more than 400 years of rule. An empire–which had a generation earlier briefly conquered Egypt and Asia Minor, even reaching as a far as Constantinople, fell to a force of lightly equipped Arabs that were used to skirmishes and desert warfare. The heavy Sasanian cavalry was too sluggish and systematized to contain them; employed light-armed Arab or East Iranian mercenaries from Khorasan and Transoxiana would have been much more successful. Sights and attractions Zibad is an ancient place with many historical places. The Davazdah Rokh war had occurred in Zibad. Sufeh Pir Sufeh Pir is another famous place in Zibad, a holy cave believed to be the tomb of Piran Viseh in the Kūh-Zibad mountain. He is a Turanian figure in Shahnameh, the national epic of Greater Iran. Beside Shahnameh, Piran is also mentioned in other sources such as Tabari and Tha'ālibī. He is the king of Khotan and the spahbed of Afrasiab, the king of Turan. According to the book of Dr. Abas Zamani Piran Viseh was buried in the cave of Sofe Zibad now called DarSufa Pir. Sarv-e Zibad The Cypress of Zibad ( Sarv-e Zibad), is a Cupressus sempervirens tree in Zibad, Sarv-e Zibad is from Qanats of Ghasabeh a UNESCO's World Heritage Sites sinc 2016,. Sarv-e Zibad is protected by the Cultural Heritage Organization of Iran as a national natural monument and is a major tourist attraction with a height of 20 metres and with a perimeter of at its trunk and higher up around its branches. It is estimated to be over two millennia old and is likely the second-oldest living lifeform in Iran. The exact age of the