The Swatis are a Pashtun

Pashtun people

Pashtuns or Pathans , also known as ethnic Afghans , are an Eastern Iranic ethnic group with populations primarily between the Hindu Kush mountains in Afghanistan and the Indus River in Pakistan...

 tribe

Tribe

A tribe, viewed historically or developmentally, consists of a social group existing before the development of, or outside of, states.Many anthropologists use the term tribal society to refer to societies organized largely on the basis of kinship, especially corporate descent groups .Some theorists...

 based around the Swat valley, in the Khyber-Pakhtunkhwa province of Pakistan

Pakistan

Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

. They are the largest tribal group of land owners in the Mansehra

Mansehra District

Mansehra District is in the Khyber Pakhtunkhwa province of Pakistan, an area still unofficially known as the Northwest Frontier. Mansehra district and town are named after Man Singh, a leading general of Mughal Emperor Akbar...

 and Battagram districts.

The Swati name associated due to their initial settlement in Swat and later on moved towards Hazara due to pressure of Mughal combined with Yousofzais.the Base tribe of Swatis is called Gabari,Mitravi and mimiali.The Gabaris were the Sultans(Royals) where as the Mitravis and Mimialis were the Dehqans(Khans,Lords of the land).Originallay they are the Descendants of Cyrus the Great(sultan Sikandar Zulqarnain)the ancient Akhamanei Tajik,Persian Royals. (also Swatey in Pashto) is considered now a major Pashtun tribe. The majority of the Swati tribe reside in the North West Frontier Province of Pakistan, and are the predominant tribe in the districts of Mansehra and Batagram and to some extent in Kohistan as well. They speak the northern variant of "Pukhtu" with the hard "kh" replacing the softer "sh" of southern Pashtun tribes. The Swatis are usually characterized by the Pashto language, adherence to Pashtunwali

Pashtunwali

Pashtunwali or Pakhtunwali is a non-written ethical code and traditional lifestyle which the indigenous Pashtun people from Afghanistan and Pakistan follow. Some in the Indian subcontinent refer to it as "Pathanwali". Its meaning may also be interpreted as "the way of the Pashtuns" or "the code of...

, some times they call it "Swatiwali" also, (a pre-Islamic indigenous religious code of honor and culture). All of the Swatis are Sunni Muslim. They are also settled in other places such as Upper Dir and Sama Swat, etc., other notable Pashtun tribes which live around them in the adjoining Districts of Abbotabad and Haripur, are Jadoons, Tareens, Yousafzais, Akhunkhels,shilmani,Kakakhels and Mashwanis.
the linke below given elaborates the history of Swatis Gabaris.
http://books.google.com.pk/books?id=bgMfoWsRGK4C&pg=PA1044&lpg=PA1044&dq=sultanate+gabari&source=