Find a square matrix whose characteristic polynomial is $P(z)$

Question

Given the following polynomial $P(z)=z^4+z^3-5z^2+z-6$, how do I find a square matrix $(A)$, of dimension 4, both with real coefficients and complex coefficients whose characteristic polynomial is $P(z)$? I have found that the roots are $z_1 = 2$, $z_2 = −3$, $z_3 = i$, $z_4 = −i$, but I do not understand how to go on. Could you help me please?