Two lawsuits which challenge a ban on same-sex marriage in the US state of Colorado will be heard in court on Monday.

One lawsuit was filed by an Adams County couple, and the second was filed by nine couples, both seek to allow same-sex couples to marry. The former is specific to the one couple while the latter seeks to strike down the same-sex marriage ban.

The lawsuits were consolidated, and will be heard together

Same-sex civil unions have been legal in Colorado since 2013, but same-sex marriages are currently banned by the state’s constitution.

The nine couples argued in their lawsuit that civil unions are an unequal alternative to marriage.

Voters approved Amendment 43, a constitutional ban on same-sex marriage, back in 2008.