The father of the Ottoman Empire Osman Gazi was born in 1258 in the town of Sogut. Osman Gazi was just 23 when he succeeded the leadership of the Kayi Clan in Sogut, in 1281. Osman Gazi appreciated the opinions of Edebali (the famous Ahi Sheik) and he respected him. He often went to Edebali's house where a dervish group meets in Eskisehir Sultanonu and been his guest.

One night, when Osman was resting at Edebali’s house (for the shelter of hospitality could never be denied even to the suitor whose addresses were rejected), the young prince, after long and melancholy musing on her whom he loved, composed his soul in that patient resignation to sorrow, which, according to the Arabs is the key to all happiness. In this mood he fell asleep, and he dreamed a dream.
Osman saw himself and his host reposing near each other. From the bosom of Edebali rose the full moon (emblem of Mal Hatoon), and inclining towards the bosom of Osman it sank upon it, and was lost to sight. After that a goodly tree sprang forth, which grew in beauty and in strength, ever greater and greater. Still did the embracing verdure of its boughs and branches cast an ampler and an ampler shade, until they canopied the extreme horizon of the three parts of the world. Under the tree stood four mountains, which he knew to be Caucasus, Atlas, Taurus, and Haemus. These mountains were the four columns that seemed to support the dome of the foliage of the sacred tree with which the earth was now centered. From the roots of the tree gushed forth four rivers, the Tigris, the Euphrates, the Danube, and the Nile. Tall ships and barks innumerable were on the waters. The fields were heavy with harvest. The mountain sides were clothed with forests. Thence in exulting and fertilizing abundance sprang fountains and rivulets that gurgled through thickets of the cypress and the rose. In the valleys glittered stately cities, with domes and cupolas, with pyramids and obelisks, with minarets and towers. The Crescent shone on their summits: from their galleries sounded the Muezzin’s call to prayer. That sound was mingled with the sweet voices of a thousand nightingales, and with the prattling of countless parrots of every hue. Every kind of singing bird was there. The winged multitude warbled and flitted around beneath the fresh living roof of the interlacing branches of the all-overarching tree; and every leaf of that tree was in shape like unto a scimitar. Suddenly there arose a mighty wind, and turned the points of the sword-leaves towards the various cities of the world, but especially towards Constantinople. That city, placed at the junction of two seas and two continents, seemed like a diamond set between two sapphires and two emeralds, to form the most precious stone in a ring of universal empire. Osman thought that he was in the act of placing that visional ring on his finger, when he awoke.[3]
Osman told this dream to his host; the vision seemed to Edebali so clearly to indicate honour, power, and glory to the posterity of Osman and Mal Hatun, that the old Sheik no longer opposed their union. They were married by the saintly Dervise Touroud, a disciple of Edebali.
Osman promised to give the officiating minister a dwelling-place near a mosque and on the bank of a river. When Osman became an independent (which is when the Ottoman Empire began), he built for the dervis a convent, which he endowed richly with villages and lands, and which remained for centuries in the possession of the family of Touroud.
Sources: http://en.wikipedia.org/wiki/Osman's_Dream, http://www.theottomans.org/english/family/osman.asp

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