Question

who dominated north India and claimed to belong to the sun or moon or fire families

Answer 1

Normally the Rajputs were the dominant figures in the northern part of the India.

Though their original origin is not known but they claimed that they were the descendants of the sun or moon or the fire families.

So they were considered the loyal families and was given utmost respectability.

Answer 2

The answer is Rajputs.

Kshatriya is one of the four social orders of Hindu Society. To fight in the war and maintain peace in the normal days are the two role of Kashatriyas in medieval era of India. In short we can call Kshatriya as Order of Defenses.  

The four social orders of medieval era are

Kshatriyas

Brahmins

Vaishya

Shudra

Kshatriya is a social order but Rajput is a caste that come under Kshatriya order. It is not necessary to be a Rajput to join the Kshatriya order.  They believed that were belong to the families of Sun and Moon.

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