An user Spanish
says…

Constituyeron
Verb
  la
Determiner
  base
Noun
  del
  sistema
Noun
  legal
Adjective
  del
  Gran Ducado
.

They formed the basis of the legal system of the Grand Duchy.
Words and sentences
New
constituyeron

third-person plural preterite indicative of constituir

New
la

New
base

New
sistema

  1. system
  2. scheme (a systematic plan of future action; also, a group of independent but interrelated elements comprising a unified whole)
  3. (colloquial) the establishment
  4. regime, system (political)

legal

  1. legal, statutory
  2. lawful
  3. (colloquial) legit

New
del

of the, from the (+ a masculine noun in singular).

New
gran ducado

grand duchy

New
gran

Apocopic form of grande; great.

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