Alaadddin Keykubat (1190–1237) was the Sultan of Anatolia Seljuk Empire (Seljuk-i Rumi) reigned from 1220 to 1237. The Sultan, sometimes styled "Keykubat the Great", is remembered today for his rich architectural legacy and the brilliant court culture that flourished under his reign. Keykubat’s reign represented the apogee of Seljuq power and influence in Anatolia, and Keykubat himself was considered the most illustrious prince of the dynasty.
He expanded the country’s coastlines and gave great importance to building navy movement. Following the two major port cities, Antalya (1207) and Sinop (1214) conquered by his father, Sultan Alaaddin Keykubat also took Alanya (1221). The city was referred to as Alaiye (Alanya) in honour of the name of the Sultan and became his winter capital. He brought the North-South line into trade, particularly making Alanya a prosperous port of Seljuk (1221-1222). This situation has increased the prestige of the Seljuk state's international commercial platform.
The Seljuks had a rich cultural life, which was the accumulation of Central Asia, Iran, Byzantine and Islamic cultures. With this accumulation in Konya, in the 13th century, the city has experienced a great development in the fields of religion and culture.
The Mongolian invasion pushed many scholars, poets and craftsmen from Turkestan and Iran to Anatolia where they were welcomed and supported by the Sultan. Konya'da kendi adına Darüşşifai Alaiyi (hastane) yaptırdı. Mevlana Jelaleddin (Rumi) was a representative of that period. Mevlana was born in 1207 in Belh (in Horasan distinct) which is now part of Afghanistan. When Mongols invaded Central Asia, between 1215 and 1220, he left Belh with his family and a group of disciples. The migrating caravan travelled extensively and eventually settled in Konya, located in the present-day western Turkey.
Alaaddin Keykubat gave great importance to scholars, ulema, kadi, sheikh among whom Shah Shihaboddin Suhreverdi, Nejmeddin Razi, Muhiddin Harabi, Huseyin Elbekri, Ahi Evren, Seyit Burhaneddin Muhakkik Tirmizi, Mevlana Jelaleddin (Rumi) and his father Bahaaddin Veled are some examples. Kani, who came from Turkestan, is another example who wrote Shehnames of Seljuk, three hundred thousand couplets, thirty volumes. Also in the field of astronomy, he invited Moonman Bibi to Konya from Damascus.
During the Alaaddin Kaykubat reign there was vast and great construction movement. Apart from reconstructing towns and fortresses, he built many mosques, medreses,caravanserais, bridges and hospitals, many of which are preserved to this day. Besides completing the construction of the Seljuq Palace in Konya, he also built the Kubatabad Palace on the shore of Lake Beyshehir and Keykubayiye Palace near Kayseri.
1- Necdet BAYRAKTAROĞLU , Selçuklu Sultanı Alaaddin Keykubat’ın Mevlana Hazretlerine Mektubu, Pazar, 07 Aralık 2014, vailable at : http://www.tarihgazetesi.net/turk-tarihi/1477-selcuklu-sultan-alaaddin-keykubat-n-mevlana-hazretlerine-mektubu.html