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As for the Seljuks, they didn't "take it all over". The farthest west that they ever ruled was the Persian Gulf and Anatolia (in Turkey). The Turkish Empire that the British dismantled in WW I was the Ottoman, a very different animal. Wikipedia: The House of Seljuq (Persian: سلجوقيان‎ Saljūqīyān; Turkish: Selçuklular), also known as the House of Seljuk Turks[1], was a Persianate[2][3][4], Turco-Persian[5][6][7][8][9] Sunni Muslim dynasty, originating from the Qynyq branch of Oghuz Turks.[10] The dynasty ruled parts of Central Asia and the Middle East from the 11th to 14th centuries. The House of Seljuq established both the Great Seljuq Empire and Sultanate of Rum, which at their total height stretched from Anatolia through Persia, and were targets of the First Crusade. Which parts of the Middle East did they rule: The Great Seljuq Empire (Persian: دولت سلجوقیان‎; Modern Turkish: Büyük Selçuklu Devleti) was a medieval Turko-Persian[8][9][10][11][12][13][14][15] Sunni Muslim empire, originating from the Qynyq branch of Oghuz Turks.[16] The Seljuq Empire controlled a vast area stretching from the Hindu Kush to eastern Anatolia and from Central Asia to the Persian Gulf. From their homelands near the Aral sea, the Seljuqs advanced first into Khorasan and then into mainland Persia before eventually conquering eastern Anatolia. The Seljuq empire was founded by Tughril Beg in 1037 after the efforts by the founder of the Seljuq dynasty, Seljuq Beg, back in the first quarter of the eleventh century. Seljuq Beg's father was in a higher position in the Oghuz Yabgu State, and gave his name both to the state and the dynasty. The Seljuqs united the fractured political scene of the Eastern Islamic world and played a key role in the first and second crusades. Highly Persianized[10][11][12][13] in culture[17][18][19] and language,[10][20][21][22][23] the Seljuqs also played an important role in the development of the Turko-Persian tradition,[24] even exporting Persian culture to Anatolia.[25][26] The settlement of Turkic tribes in the northwestern peripheral parts of the empire, for the strategic military purpose of fending off invasions from neighboring states, led to the progressive turkicization of those areas.[27] There. All organized.

Oops. Not all organized. I really must learn this HTML thing.

Different animal? Yes and no. The Ottoman Turks were Oghuz Turks and they took over the collapsed Seljuk Khanate. The only reason they were in Anatolia in the first place was that the Seljuk Turks won (or at least Byzantine infighting lost) the Battle of Manzikert.