According to 2 Samuel, Adonijah (Hebrew: אֲדֹנִיָּה, ’Ǎḏōnīyyā; "my lord is Yah") was the fourth son of King David.
(KJV) Adonijah consulted and obtained the support of both the commander of the army Joab and the influential priest Abiathar.
However, the priest Zadok, Benaiah (head of the king's bodyguard), Nathan (the court prophet), and others did not side with Adonijah.
In anticipation of his father's imminent death, Adonijah invited his brother princes and the court officials to a solemn sacrifice in order to announce his claim to the throne.
According to the Jewish Study Bible, by excluding Solomon, Adonijah demonstrates his awareness that he is in effect usurping the throne.