With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
These
castles
he
stoutly
defended
against
John
,
Count
of
Mortain
,
the
king
's
younger
brother
,
who
in
the
monarch
's
absence
endeavoured
to
usurp
the
sovereign
power
.
These:O
castles:O
he:O
stoutly:O
defended:O
against:O
John:person-other
,:O
Count:O
of:O
Mortain:location-GPE
,:O
the:O
king:O
's:O
younger:O
brother:O
,:O
who:O
in:O
the:O
monarch:O
's:O
absence:O
endeavoured:O
to:O
usurp:O
the:O
sovereign:O
power:O
.:O