Composition, thermally conductive material, thermally conductive sheet, and device with thermally conductive layer

A composition comprising:

• a phenolic compound;
• an epoxy compound;
• a compound represented by Formula (1);
• and
• an inorganic nitride;
• and in Formula (1), R1 to R3 each independently represent a substituent, n1 to n3 each independently represents an integer of 0 to 5, and the sum of n1 to n3 is an integer of 1 to 15,
• wherein the phenolic compound is at least one selected from the group consisting of a compound represented by General Formula (P1) and a compound represented by General Formula (P3),
• in General Formula (P1), ml represents 0 or 1,
• na and nc each independently represent 2 or 3,
• Ar1 and Ar2 each independently represent a benzene ring group or a naphthalene ring group,
• R1 and R6 each independently represent a hydrogen atom, a halogen atom, a carboxylic acid group, a boronic acid group, an aldehyde group, an alkyl group, an alkoxy group, or an alkoxycarbonyl group,
• Lx1 represents a single bond, —C(R2)(R3)— or —CO—,
• Lx2 represents a single bond, —C(R4)(R5)— or —CO—,
• R2 to R5 each independently represent a hydrogen atom or a substituent,
• R7 represents a hydrogen atom or a hydroxyl group,
• Qa represents a hydrogen atom, an alkyl group, a phenyl group, a halogen atom, a carboxylic acid group, a boronic acid group, an aldehyde group, an alkoxy group, or an alkoxycarbonyl group,
• in General Formula (P3), E1 to E3 each independently represent a single bond, —NH—, or —NR—,
• R represents a substituent,
• B1 to B3 each independently represent an aromatic hydrocarbon ring group which may have a substituent,
• X1 to X3 each independently represent a hydroxyl group,
• l, m, and n each independently represent an integer of 0 or greater, and
• the sum of l, m, and n is 2 or greater.