How did the Velasquez Rodriguez case come before the Inter-American Court of Human Rights? What is this court? What were the allegations in the case? What issue was the Court required to address?

Velasquez, state obligations and the due diligence principle

How did the Velasquez Rodriguez case come before the Inter-American Court of Human Rights? What is this court?
What were the allegations in the case?
What issue was the Court required to address?
What did the Court find? (para 178-182)
What did the Court identify as the obligations of States parties to the Inter-American Convention on Human Rights under Article 1(1)? (paras 165-166)
What do these obligations entail? (para 166)
For whose acts is a State responsible under international law? (para 170, 172)
In what other circumstances might a State be held responsible under international law for human rights violations (paras 172-177)
What failures by the State did the court identify (paras 178-180)
Why was Honduras held responsible for the disappearance of Velasquez (para 182).
Summarise the due diligence principle in your own words and explain its significance for the enforcement of international human rights standards.
Why might the due diligence principle be especially relevant in relation to violence against women?
What is the name of the equivalent principle in ECHR jurisprudence?