nolraitru lujvo

t1=n1 is a regent/monarch of t2 by standard n2.

Cf. nobli, traji, turni, balnoltru, noltruni'u, noltrunau, noltroni'u, noltronau, nolse'u, nolkansa, gugja'a, truralju.

In notes:

turni
x1 governs/rules/is ruler/governor/sovereign/reigns over people/territory/domain/subjects x2.
balnoltru
t1=n1=b1 is the emperor/empress/kaiser/tsar of peoples/territories t2.
merja'a
m1=j1 is a president of the United States of America.
nolkansa
k1 is a courtier to sovereign/aristocrat/noble k2 in culture/country n2=k3.
nolse'u
s1 is a servant of sovereign/aristocrat/noble s2=n1 in culture/country n2 with responsibilities s3.
noltronau
ni1=j1=no1 is a Duke/Baron/Count/Earl/Marquess/ [titled noble of middle rank] ruling j2 under culture/standard no2.
noltroni'u
ni1=j1=no1 is a Duchess/Baroness/Countess/Marchioness/ [titled noble of middle rank] ruling j2 under culture/standard no2..
noltrunau
x1 is the king of x2 by standard x3.
noltruni'u
x1 is the queen of x2 by standard x3.
truralju
r1 is the head-of-government of polity t2.
vipnoltru
v1=t1 is the appointed governor/governor-general/lieutenant-governor over territory t2 representing principal v3
partako
x1 is a patriarch, male governor
presidente
x1 is the head of x2 (state of a republic, a representative democracy or, more seldom, a dictatorship); x1 is a president of x2 (state/organisation etc.)
xu'andi
x1 is an emperor of empire x2
patriarko
x1 is a patriarch, male governor